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145-581: The Fairchild AT-21 was an American World War II specialized bomber crew trainer, intended to train crews in the use of power gun turrets or a gun on a flexible mount, as well as learn to function as a member of a crew. It had a brief career as a training aircraft before modified bombers took over this role. The United States Army Air Corps (USAAC) issued a specification for a specialized bomber trainer, ordering two prototypes from Fairchild Aircraft . The XAT-13 powered by two 450 hp (340 kW) Pratt & Whitney R-1340 -AN-1 radial engines, emerged as

290-659: A Neutrality Pact in April 1941, and Japan adopted the doctrine of Nanshin-ron , promoted by the Navy, which took its focus southward and eventually led to war with the United States and the Western Allies. In Europe, Germany and Italy were becoming more aggressive. In March 1938, Germany annexed Austria , again provoking little response from other European powers. Encouraged, Hitler began pressing German claims on

435-578: A cautious French probe into the Saarland . The Western Allies also began a naval blockade of Germany , which aimed to damage the country's economy and war effort. Germany responded by ordering U-boat warfare against Allied merchant and warships, which would later escalate into the Battle of the Atlantic . On 8 September, German troops reached the suburbs of Warsaw . The Polish counter-offensive to

580-593: A "scaled down" bomber with a single machine gun in the glazed nose and a top turret with twin machine guns and fitted with tricycle landing gear. The concept was to have a single type that was able to duplicate the bomber crew positions from piloting, navigation, bomb aiming/dropping to aerial gunnery. The second prototype, designated the XAT-14 was similar in layout but was powered by two 520 hp (388 kW) Ranger V-770 inline inverted 12-cylinder vee-type engines. It first flew in late 1942. A further refinement to suit

725-475: A 3 mi (4.8 km) radius from point of aim in any case. The United States Army Air Forces adopted a policy of daylight precision bombing for greater accuracy as, for example, during the Schweinfurt raids. That doctrine, based on the erroneous supposition that bombers could adequately defend themselves against air attack, entailed much higher American losses until long-range fighter escorts (e.g.

870-581: A combined-arms attack which would be developed to a significant degree by Germany , and which contributed much to the success of the Wehrmacht during the first four years (1939–42) of World War II. The Luftwaffe became a major element of the German blitzkrieg . Some leading theorists of strategic air warfare , namely strategic bombing during this period were the Italian Giulio Douhet ,

1015-425: A high proportion of incendiary devices , to bomb the target region indiscriminately—to kill war workers, destroy materiel , and demoralize the enemy. In high enough concentration, it was capable of producing a firestorm . The high explosives were often delay-action bombs intended to kill or intimidate those fighting the fires caused by incendiaries. At first this required multiple aircraft, often returning to

1160-472: A military strategy proved to be an effective and efficient way for the British to police their Middle East protectorates in the 1920s. Fewer men were required as compared to ground forces. Pre-war planners, on the whole, vastly overestimated the damage bombers could do, and underestimated the resilience of civilian populations. Jingoistic national pride played a major role: for example, at a time when Germany

1305-464: A new one. This was completed on 1 April 1945 and started instead with the usual euphemism used when referring to strategic bombing: "It seems to me that the moment has come when the question of the so called 'area-bombing' of German cities should be reviewed from the point of view of our own interests....". Many strategic bombing campaigns and individual raids of aerial warfare have been described as "terror bombing" by commentators and historians since

1450-524: A pretext to initiate the invasion. The first German attack of the war came against the Polish defences at Westerplatte . The United Kingdom responded with an ultimatum for Germany to cease military operations, and on 3 September, after the ultimatum was ignored, Britain and France declared war on Germany. During the Phoney War period, the alliance provided no direct military support to Poland, outside of

1595-673: A pretext to worsen relations. On 29 August, Hitler demanded that a Polish plenipotentiary immediately travel to Berlin to negotiate the handover of Danzig , and to allow a plebiscite in the Polish Corridor in which the German minority would vote on secession. The Poles refused to comply with the German demands, and on the night of 30–31 August in a confrontational meeting with the British ambassador Nevile Henderson , Ribbentrop declared that Germany considered its claims rejected. On 1 September 1939, Germany invaded Poland after having staged several false flag border incidents as

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1740-491: A raid in the afternoon of June 22, 1916, the pilots used outdated maps and bombed the location of the abandoned railway station, where a circus tent was placed, killing 120 persons, most of them children. The British also stepped up their strategic bombing campaign. In late 1915, the order was given for attacks on German industrial targets, and the 41st Wing was formed from units of the RNAS and Royal Flying Corps . The RNAS took to

1885-504: A result, bomb loads were regularly dropped "blind" using dead-reckoning methods little different from those used by the RAF night bombers. In addition, only the leading bomber in a formation actually utilized the Norden sight, the rest of the formation dropping their bombs only when they saw the lead aircraft's bombload falling away. Since even a very tight bomber formation could cover a vast area,

2030-475: A secret protocol that defined German and Soviet "spheres of influence" (western Poland and Lithuania for Germany; eastern Poland , Finland, Estonia , Latvia and Bessarabia for the Soviet Union), and raised the question of continuing Polish independence. The pact neutralised the possibility of Soviet opposition to a campaign against Poland and assured that Germany would not have to face the prospect of

2175-774: A similar pact and rejected ceding part of its territory to the Soviet Union. The Soviet Union invaded Finland in November 1939, and was subsequently expelled from the League of Nations for this crime of aggression. Despite overwhelming numerical superiority, Soviet military success during the Winter War was modest, and the Finno-Soviet war ended in March 1940 with some Finnish concessions of territory . In June 1940,

2320-531: A trainer due to vibration and oscillation tendencies, as well as an inherent instability caused by the short distance between the rudders and the gull wing. The aerodynamic instability resulted in unacceptable yaw when even slight rudder movements were made. Deemed unsuitable for its original purpose, the AT-21 was evaluated as an advanced pilot trainer. This also did not work out well, due to poor single-engine performance and multiple landing gear problems. The aircraft

2465-531: A two-front war, as it had in World War   I. Immediately afterwards, Hitler ordered the attack to proceed on 26 August, but upon hearing that the United Kingdom had concluded a formal mutual assistance pact with Poland and that Italy would maintain neutrality, he decided to delay it. In response to British requests for direct negotiations to avoid war, Germany made demands on Poland, which served as

2610-411: A young RAF squadron commander (later nicknamed "Bomber" ), reported after a mission in 1924, "The Arab and Kurd now know what real bombing means, in casualties and damage. They know that within 45 minutes a full-sized village can be practically wiped out and a third of its inhabitants killed or injured". On an official level, RAF directives stressed: In these attacks, endeavour should be made to spare

2755-604: The Anglo-German Naval Agreement and the German–Polish declaration of non-aggression . The situation became a crisis in late August as German troops continued to mobilise against the Polish border. On 23 August the Soviet Union signed a non-aggression pact with Germany, after tripartite negotiations for a military alliance between France, the United Kingdom, and Soviet Union had stalled. This pact had

2900-522: The Avro Lancaster , and 20,000 lb (9,000 kg) B-29 Superfortress , with some specialized aircraft, such as the 'Special B' Avro Lancaster carrying the 22,000 lb (10,000 kg) Grand Slam . During the first year of the war in Europe, strategic bombing was developed through trial and error. The Luftwaffe had been attacking both civilian and military targets from the first day of

3045-689: The British Empire , with fighting in the Balkans , Mediterranean, and Middle East , the aerial Battle of Britain and the Blitz , and naval Battle of the Atlantic . Through a series of campaigns and treaties, Germany took control of much of continental Europe and formed the Axis alliance with Italy , Japan , and other countries. In June 1941, Germany led the European Axis in an invasion of

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3190-581: The German Revolution of 1918–1919 , and a democratic government, later known as the Weimar Republic , was created. The interwar period saw strife between supporters of the new republic and hardline opponents on both the political right and left. Italy, as an Entente ally, had made some post-war territorial gains; however, Italian nationalists were angered that the promises made by the United Kingdom and France to secure Italian entrance into

3335-800: The German invasion of Poland and the United Kingdom and France 's declaration of war on Germany two days later on 3 September 1939. Dates for the beginning of the Pacific War include the start of the Second Sino-Japanese War on 7 July 1937, or the earlier Japanese invasion of Manchuria , on 19 September 1931. Others follow the British historian A. J. P. Taylor , who stated that the Sino-Japanese War and war in Europe and its colonies occurred simultaneously, and

3480-597: The Imperial Japanese Army Air Service frequently used strategic bombing over Singaporean, Burmese, and Chinese cities such as Shanghai , Guangzhou , Nanjing , Chongqing , Singapore , and Rangoon . However, the Japanese military in most places advanced quickly enough that a strategic bombing campaign was unnecessary, and the Japanese aircraft industry was incapable of producing truly strategic bombers in any event. In those places where it

3625-576: The Italian mainland , and Allied offensives in the Pacific—cost the Axis powers their initiative and forced them into strategic retreat on all fronts. In 1944, the Western Allies invaded German-occupied France at Normandy , while the Soviet Union regained its territorial losses and pushed Germany and its allies westward. At the same time, Japan suffered reversals in mainland Asia, while the Allies crippled

3770-553: The Japanese Navy and captured key islands . The war in Europe concluded with the liberation of German-occupied territories ; the invasion of Germany by the Western Allies and the Soviet Union, culminating in the fall of Berlin to Soviet troops; Hitler's suicide ; and the German unconditional surrender on 8 May 1945 . Following the refusal of Japan to surrender on the terms of the Potsdam Declaration ,

3915-695: The League of Nations as a force to preserve peace. Both Italy and Ethiopia were member nations, but the League did little when the former clearly violated Article X of the League's Covenant . The United Kingdom and France supported imposing sanctions on Italy for the invasion, but the sanctions were not fully enforced and failed to end the Italian invasion. Italy subsequently dropped its objections to Germany's goal of absorbing Austria . When civil war broke out in Spain, Hitler and Mussolini lent military support to

4060-569: The Mustang ) became available. Conditions in the European theatre made it very difficult to achieve the accuracy achieved using the exceptional and top-secret Norden optical bombsight in the clear skies over the desert bombing ranges of Nevada and California. Raids over Europe commonly took place in conditions of very poor visibility, with targets partly or wholly obscured by thick cloud, smokescreens, or smoke from fires started by previous raids. As

4205-731: The Nationalist rebels , led by General Francisco Franco . Italy supported the Nationalists to a greater extent than the Nazis: Mussolini sent more than 70,000 ground troops, 6,000 aviation personnel, and 720 aircraft to Spain. The Soviet Union supported the existing government of the Spanish Republic . More than 30,000 foreign volunteers, known as the International Brigades , also fought against

4350-690: The Rome–Berlin Axis . A month later, Germany and Japan signed the Anti-Comintern Pact , which Italy joined the following year. The Kuomintang (KMT) party in China launched a unification campaign against regional warlords and nominally unified China in the mid-1920s, but was soon embroiled in a civil war against its former Chinese Communist Party (CCP) allies and new regional warlords . In 1931, an increasingly militaristic Empire of Japan , which had long sought influence in China as

4495-619: The Second World War (1 September 1939 – 2 September 1945) was a global conflict between two coalitions: the Allies and the Axis powers . Nearly all the world's countries —including all the great powers —participated, with many investing all available economic, industrial, and scientific capabilities in pursuit of total war , blurring the distinction between military and civilian resources. Tanks and aircraft played major roles , with

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4640-590: The Soviet–Japanese Neutrality Pact in April 1941. By contrast, the Germans were steadily making preparations for an attack on the Soviet Union, massing forces on the Soviet border. Hitler believed that the United Kingdom's refusal to end the war was based on the hope that the United States and the Soviet Union would enter the war against Germany sooner or later. On 31 July 1940, Hitler decided that

4785-598: The Stresa Front in April 1935 in order to contain Germany, a key step towards military globalisation ; however, that June, the United Kingdom made an independent naval agreement with Germany, easing prior restrictions. The Soviet Union, concerned by Germany's goals of capturing vast areas of Eastern Europe , drafted a treaty of mutual assistance with France. Before taking effect, though, the Franco-Soviet pact

4930-709: The Sudetenland , an area of Czechoslovakia with a predominantly ethnic German population. Soon the United Kingdom and France followed the appeasement policy of British Prime Minister Neville Chamberlain and conceded this territory to Germany in the Munich Agreement , which was made against the wishes of the Czechoslovak government, in exchange for a promise of no further territorial demands. Soon afterwards, Germany and Italy forced Czechoslovakia to cede additional territory to Hungary, and Poland annexed

5075-707: The Tanggu Truce was signed in 1933. Thereafter, Chinese volunteer forces continued the resistance to Japanese aggression in Manchuria , and Chahar and Suiyuan . After the 1936 Xi'an Incident , the Kuomintang and CCP forces agreed on a ceasefire to present a united front to oppose Japan. The Second Italo-Ethiopian War was a brief colonial war that began in October 1935 and ended in May 1936. The war began with

5220-579: The Trans-Olza region of Czechoslovakia. Although all of Germany's stated demands had been satisfied by the agreement, privately Hitler was furious that British interference had prevented him from seizing all of Czechoslovakia in one operation. In subsequent speeches Hitler attacked British and Jewish "war-mongers" and in January 1939 secretly ordered a major build-up of the German navy to challenge British naval supremacy. In March 1939, Germany invaded

5365-558: The Treaty of Craiova . The loss of one-third of Romania's 1939 territory caused a coup against King Carol II, turning Romania into a fascist dictatorship under Marshal Ion Antonescu , with a course set towards the Axis in the hopes of a German guarantee. Meanwhile, German-Soviet political relations and economic co-operation gradually stalled, and both states began preparations for war. In April 1940, Germany invaded Denmark and Norway to protect shipments of iron ore from Sweden , which

5510-749: The United Kingdom and France to declare war on Germany. Poland was divided between Germany and the Soviet Union under the Molotov–Ribbentrop Pact , in which they had agreed on " spheres of influence " in Eastern Europe. In 1940, the Soviets annexed the Baltic states and parts of Finland and Romania . After the fall of France in June 1940, the war continued mainly between Germany and

5655-653: The Wehrmacht rapidly advanced to the Channel and cut off the Allied forces in Belgium, trapping the bulk of the Allied armies in a cauldron on the Franco-Belgian border near Lille. The United Kingdom was able to evacuate a significant number of Allied troops from the continent by early June, although they had to abandon almost all their equipment. On 10 June, Italy invaded France , declaring war on both France and

5800-630: The aftermath of World War I and the rise of fascism in Europe and militarism in Japan . Key events leading up to the war included Japan's invasion of Manchuria , the Spanish Civil War , the outbreak of the Second Sino-Japanese War , and Germany's annexations of Austria and the Sudetenland . World War II is generally considered to have begun on 1 September 1939, when Nazi Germany , under Adolf Hitler , invaded Poland , prompting

5945-478: The appeasement of Hitler in the late 1930s. During the Spanish Civil War , the bombing of Guernica by German aviators including the Condor Legion , under Nationalist command, resulted in its near destruction. Casualties were estimated to be between 500 and 1500. Though this figure was relatively small, aerial bombers and their weaponry were continually improving—already suggesting the devastation that

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6090-494: The law of war , or if within the laws of war are nevertheless a moral crime. According to John Algeo in Fifty Years among the New Words: A Dictionary of Neologisms 1941–1991 , the first recorded usage of "Terror bombing" in a United States publication was in a Reader's Digest article dated June 1941, a finding confirmed by the Oxford English Dictionary . Aerial attacks described as terror bombing are often long range strategic bombing raids, although attacks which result in

6235-404: The reunification of East and West Germany to take place and resolved most post–World War   II issues. No formal peace treaty between Japan and the Soviet Union was ever signed, although the state of war between the two countries was terminated by the Soviet–Japanese Joint Declaration of 1956 , which also restored full diplomatic relations between them. World War I had radically altered

6380-423: The 1930s—in the Spanish Civil War and the Second Sino-Japanese War —they were ineffective. Commentators observed the failures and some air forces, such as the Luftwaffe , concentrated their efforts upon direct support of the troops. Terror bombing is a term used for aerial attacks planned to weaken or break enemy morale. Use of the term to refer to aerial attacks implies the attacks are criminal according to

6525-507: The AT-21 design. Optionally piloted for flight testing and intended to carry 4,000 lb (1,800 kg) of explosive, the XBQ-3 first flew in July 1944, but the project was cancelled later that year. Data from The Complete Encyclopedia of World Aircraft General characteristics Performance Armament Related development Related lists World War II Asia-Pacific Mediterranean and Middle East Other campaigns Coups World War II or

6670-402: The Allied campaign against Germany only really succeeded when the Allies began targeting oil refineries and transportation in the last year of the war. At the same time, the strategic bombing of Germany was used as a morale booster for the Allies in the period before the land war resumed in Western Europe in June 1944. In the Asiatic-Pacific Theater , the Imperial Japanese Navy Air Service and

6815-440: The Allied news media did the same. However, at a SHAEF press conference on 16 February 1945, two days after the bombing of Dresden , British Air Commodore Colin McKay Grierson replied to a question by one of the journalists that the primary target of the bombing had been on communications to prevent the Germans from moving military supplies and to stop movement in all directions if possible. He then added in an offhand remark that

6960-409: The Allies were attempting to cut off . Denmark capitulated after six hours , and despite Allied support , Norway was conquered within two months. British discontent over the Norwegian campaign led to the resignation of Prime Minister Neville Chamberlain , who was replaced by Winston Churchill on 10   May 1940. On the same day, Germany launched an offensive against France . To circumvent

7105-400: The Axis war against the Soviet Union, in Romania's case partially to recapture territory ceded to the Soviet Union . In early June 1940, the Italian Regia Aeronautica attacked and besieged Malta , a British possession. From late summer to early autumn, Italy conquered British Somaliland and made an incursion into British-held Egypt . In October, Italy attacked Greece , but the attack

7250-450: The Belgian city of Liège , killing nine civilians. The second attack was on the night of 24–25 August 1914, when eight bombs were dropped from a German airship onto the Belgian city of Antwerp . The first effective strategic bombing was pioneered by the Royal Naval Air Service (RNAS) in 1914. The mission was to attack the Zeppelin production lines and their sheds at Cologne (Köln) and Düsseldorf . Led by Charles Rumney Samson ,

7395-421: The Blitz , but largely ended in May 1941 after failing to significantly disrupt the British war effort. Using newly captured French ports, the German Navy enjoyed success against an over-extended Royal Navy , using U-boats against British shipping in the Atlantic . The British Home Fleet scored a significant victory on 27   May 1941 by sinking the German battleship Bismarck . In November 1939,

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7540-426: The British and Americans (who started the war with predominantly similarly sized bombers) developed their strategic force based upon much larger four-engined bombers for their strategic campaigns. The payload carried by these planes ranged from 4,000 lb (1,800 kg) for the B-17 Flying Fortress on long-range missions, to 8,000 lb (3,600 kg) for the B-24 Liberator , 14,000 lb (6,400 kg) for

7685-430: The British be cowed into making peace. At first the Luftwaffe raids took place in daylight, but changed to night bombing attacks when losses became unsustainable. The RAF, who had preferred precision bombing, also switched to night bombing, also due to excessive losses. Before the Rotterdam Blitz on 14 May 1940 the British restricted themselves to tactical bombing west of the Rhine and naval installations. The day after

7830-475: The Eastern England towns of Great Yarmouth , Sheringham , King's Lynn , and the surrounding villages. In all, four people were killed and sixteen injured, and monetary damage was estimated at £7,740 (about US$ 36,000 at the time). German airships also bombed on other fronts, for example in January 1915 on Liepāja in Latvia. In 1915 there were 19 more raids, in which 37 tons of bombs were dropped, killing 181 people and injuring 455. Raids continued in 1916. London

7975-405: The European Axis declaring war on the US. Japan conquered much of coastal China and Southeast Asia , but its advances in the Pacific were halted in mid-1942 after its defeat in the naval Battle of Midway ; Germany and Italy were defeated in North Africa and at Stalingrad in the Soviet Union. Key setbacks in 1943—including German defeats on the Eastern Front, the Allied invasions of Sicily and

8120-410: The French possessions of Syria and Lebanon , assisted by the Free French . With the situation in Europe and Asia relatively stable, Germany, Japan, and the Soviet Union made preparations for war. With the Soviets wary of mounting tensions with Germany, and the Japanese planning to take advantage of the European War by seizing resource-rich European possessions in Southeast Asia , the two powers signed

8265-447: The German Naval Airship Department. By the end of the war, 51 raids had been undertaken, in which 5,806 bombs were dropped, killing 557 people and injuring 1,358. These raids caused only minor hampering of wartime production, by later standards. A much greater impact was the diversion of twelve aircraft squadrons, many guns, and over 10,000 men to air defenses. The raids generated a wave of hysteria, partially caused by media. This revealed

8410-426: The Germans, and the last large operational unit of the Polish Army surrendered on 6   October . Despite the military defeat, Poland never surrendered; instead, it formed the Polish government-in-exile and a clandestine state apparatus remained in occupied Poland. A significant part of Polish military personnel evacuated to Romania and Latvia; many of them later fought against the Axis in other theatres of

8555-419: The Japanese island of Iwo Jima further enhanced the capabilities that the Americans possessed in their strategic bombing campaign. High-explosive and incendiary bombs were used against Japan to devastating effect, with greater indiscriminate loss of life in the firebombing of Tokyo on March 9–10, 1945 than was caused either by the Dresden mission , or the atomic bombs dropped on Hiroshima or Nagasaki . Unlike

8700-450: The Nationalists. Both Germany and the Soviet Union used this proxy war as an opportunity to test in combat their most advanced weapons and tactics. The Nationalists won the civil war in April 1939; Franco, now dictator, remained officially neutral during World War   II but generally favoured the Axis . His greatest collaboration with Germany was the sending of volunteers to fight on the Eastern Front . In July 1937, Japan captured

8845-750: The Rotterdam Blitz a new directive was issued to the RAF to attack targets in the Ruhr , including oil plants and other civilian industrial targets which aided the German war effort, such as blast furnaces that at night were self-illuminating. After the Butt Report (released in September 1941) proved the inadequacy of RAF Bomber Command training methods and equipment, the RAF adopted an area-attack strategy, by which it hoped to impede Germany's war production, her powers of resistance (by destroying resources and forcing Germany to divert resources from her front lines to defend her air space), and her morale. The RAF dramatically improved its navigation so that on average its bombs hit closer to target. Accuracy never exceeded

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8990-452: The Royal Navy putting three Italian battleships out of commission after a carrier attack at Taranto , and neutralising several more warships at the Battle of Cape Matapan . Italian defeats prompted Germany to deploy an expeditionary force to North Africa; at the end of March 1941, Rommel 's Afrika Korps launched an offensive which drove back Commonwealth forces. In less than a month, Axis forces advanced to western Egypt and besieged

9135-423: The Soviet Union occupied the entire territories of Estonia, Latvia and Lithuania, as well as the Romanian regions of Bessarabia, Northern Bukovina, and the Hertsa region . In August 1940, Hitler imposed the Second Vienna Award on Romania which led to the transfer of Northern Transylvania to Hungary. In September 1940, Bulgaria demanded Southern Dobruja from Romania with German and Italian support, leading to

9280-421: The Soviet Union , opening the Eastern Front and initially making large territorial gains. Japan aimed to dominate East Asia and the Asia-Pacific , and by 1937 was at war with the Republic of China . In December 1941, Japan attacked American and British territories in Southeast Asia and the Central Pacific , including Pearl Harbor in Hawaii , which resulted in the US and the UK declaring war against Japan, and

9425-418: The Soviet Union and Mongolia . The Japanese doctrine of Hokushin-ron , which emphasised Japan's expansion northward, was favoured by the Imperial Army during this time. This policy would prove difficult to maintain in light of the Japanese defeat at Khalkin Gol in 1939, the ongoing Second Sino-Japanese War and ally Nazi Germany pursuing neutrality with the Soviets. Japan and the Soviet Union eventually signed

9570-575: The Soviet Union should be eliminated and aimed for the conquest of Ukraine , the Baltic states and Byelorussia . However, other senior German officials like Ribbentrop saw an opportunity to create a Euro-Asian bloc against the British Empire by inviting the Soviet Union into the Tripartite Pact. In November 1940, negotiations took place to determine if the Soviet Union would join the pact. The Soviets showed some interest but asked for concessions from Finland, Bulgaria, Turkey, and Japan that Germany considered unacceptable. On 18 December 1940, Hitler issued

9715-404: The Spanish Nationalists, generally agreed. The strategic bombing conducted in World War II was unlike any before. The campaigns conducted in Europe and Asia could involve aircraft dropping thousands of tons of conventional bombs or a nuclear weapon over a single city. Area bombardment came to prominence during World War II with the use of large numbers of unguided gravity bombs , often with

9860-565: The Trenchard school in Great Britain, and General Billy Mitchell in the United States. These theorists thought that aerial bombardment of the enemy's homeland would be an important part of future wars. Not only would such attacks weaken the enemy by destroying important military infrastructure, they would also break the morale of the civilian population, forcing their government to capitulate. Although area bombing theorists acknowledged that measures could be taken to defend against bombers—using fighter planes and anti-aircraft artillery —the maxim of

10005-402: The US dropped the first atomic bombs on Hiroshima and Nagasaki on 6 and 9 August. Faced with an imminent invasion of the Japanese archipelago , the possibility of further atomic bombings, and the Soviet declaration of war against Japan and its invasion of Manchuria , Japan announced its unconditional surrender on 15 August and signed a surrender document on 2 September 1945 , marking

10150-492: The USAAF's strategic bombing campaign in Europe, with its avowed (if unachievable) objective of precision bombing of strategic targets, the bombing of Japanese cities involved the deliberate targeting of residential zones from the outset. Bomb loads included very high proportions of incendiaries, with the intention of igniting the highly combustible wooden houses common in Japanese cities and thereby generating firestorms. The final development of strategic bombing in World War II

10295-424: The United Kingdom and France guaranteed their support for Polish independence ; when Italy conquered Albania in April 1939, the same guarantee was extended to the Kingdoms of Romania and Greece . Shortly after the Franco - British pledge to Poland, Germany and Italy formalised their own alliance with the Pact of Steel . Hitler accused the United Kingdom and Poland of trying to "encircle" Germany and renounced

10440-542: The United Kingdom attacked on 3   July in an attempt to prevent its seizure by Germany. The air Battle of Britain began in early July with Luftwaffe attacks on shipping and harbours . The German campaign for air superiority started in August but its failure to defeat RAF Fighter Command forced the indefinite postponement of the proposed German invasion of Britain . The German strategic bombing offensive intensified with night attacks on London and other cities in

10585-463: The United Kingdom, and General Billy Mitchell in the United States. These theorists were highly influential, both on the military justification for an independent air force (such as the Royal Air Force ) and in influencing political thoughts on a future war as exemplified by Stanley Baldwin 's 1932 comment that the bomber will always get through . One of the aims of war is to demoralize

10730-461: The United Kingdom. The Germans turned south against the weakened French army, and Paris fell to them on 14   June. Eight days later France signed an armistice with Germany ; it was divided into German and Italian occupation zones , and an unoccupied rump state under the Vichy Regime , which, though officially neutral, was generally aligned with Germany. France kept its fleet, which

10875-660: The United States was assisting China and the Western Allies, and had amended the Neutrality Act to allow "cash and carry" purchases by the Allies. In 1940, following the German capture of Paris, the size of the United States Navy was significantly increased . In September the United States further agreed to a trade of American destroyers for British bases . Still, a large majority of the American public continued to oppose any direct military intervention in

11020-521: The United States, where excerpts from his book The Command of the Air (1921) were published. These visions of cities laid waste by bombing also gripped the popular imagination and found expression in novels such as Douhet's The War of 19-- (1930) and H. G. Wells 's The Shape of Things to Come (1933) (filmed by Alexander Korda as Things to Come (1936)). Douhet's proposals were hugely influential among air force enthusiasts, arguing as they did that

11165-606: The Yellow River ; this manoeuvre bought time for the Chinese to prepare their defences at Wuhan , but the city was taken by October. Japanese military victories did not bring about the collapse of Chinese resistance that Japan had hoped to achieve; instead, the Chinese government relocated inland to Chongqing and continued the war. In the mid-to-late 1930s, Japanese forces in Manchukuo had sporadic border clashes with

11310-652: The Yemeni side, were 65 killed or wounded (one RAF pilot was killed and one airman wounded). Between the wars the RAF conducted 26 separate air operations within the Aden Protectorate. The majority were conducted in response to persistent banditry or to restore the Government's authority. Excluding operations against Yemeni forces—which had effectively ceased by 1934—a total of twelve deaths were attributed to air attacks conducted between 1919 and 1939. Bombing as

11455-654: The acceptance of the provisions of the Joint Declaration of the Powers. Nuclear weapons defined strategic bombing during the Cold War . The age of the massive strategic bombing campaign had come to an end. It was replaced by more devastating attacks using improved targeting and weapons technology. Strategic bombing by the Great Powers also became politically indefensible. The political fallout resulting from

11600-478: The air raids with a series of night infiltration bombings of ADD airfields near Leningrad . Strategic bombing in Europe never reached the decisive completeness the American campaign against Japan achieved, helped in part by the fragility of Japanese housing , which was particularly vulnerable to firebombing through the use of incendiary devices . The destruction of German infrastructure became apparent, but

11745-1044: The aircraft for bombardier training with the nose gun and turret removed, led to a new designation, the XAT-14A . Both prototypes featured an unusual construction, being built from " Duramold " plastic-bonded plywood. At the end of the testing period, the USAAC ordered the inline version as the AT-21 Gunner, specialized for gunnery training. The AT-21 had a crew of five, pilot, co-pilot/gunnery instructor and three pupils. Fairchild Aircraft Company built one aircraft in Hagerstown and 106 aircraft at their Burlington, North Carolina plant in 1943 and 1944, while Bellanca Aircraft built 39 at New Castle, Delaware , and McDonnell built 30 aircraft at their St. Louis plant. Both companies were enlisted to speed production and delivery to training units. The AT-21 proved unsuitable for use as

11890-521: The bombing air arm was the most important, powerful, and invulnerable part of any military. He envisaged future wars as lasting a matter of a few weeks. While each opposing Army and Navy fought an inglorious holding campaign, the respective Air Forces would dismantle their enemies' country, and if one side did not rapidly surrender, both would be so weak after the first few days that the war would effectively cease. Fighter aircraft would be relegated to spotting patrols but would be essentially powerless to resist

12035-507: The bombing of railways, trains, canals, and roads more harmful to production than attacks on factories themselves, Sir Roy Fedden (in his report on a postwar British scientific intelligence mission) calling it "fatal" and saying it reduced aero-engine production by two thirds (from a maximum output of 5,000 to 7,000 a month). Strategic bombing was a way of taking the war into Europe while Allied ground forces were unable to do so. Between them, Allied air forces claimed to be able to bomb "around

12180-461: The capital Nanking in December 1937. After the fall of Nanking, tens or hundreds of thousands of Chinese civilians and disarmed combatants were murdered by the Japanese . In March 1938, Nationalist Chinese forces won their first major victory at Taierzhuang , but then the city of Xuzhou was taken by the Japanese in May. In June 1938, Chinese forces stalled the Japanese advance by flooding

12325-511: The civilian population , thought to be demoralizing to the enemy, seemed to have the opposite effect. E. B. Strauss surmised, "Observers state that one of the most remarkable effects of the bombing of open towns in Government Spain had been the welding together into a formidable fighting force of groups of political factions who were previously at each other's throats...", a sentiment with which Hitler 's Luftwaffe , supporting

12470-483: The clock". In fact, few targets were ever hit by British and American forces the same day, the strategic isolation of Normandy on D-Day and the bombing of Dresden in February 1945 being exceptions rather than the rule. There were generally no coordinated plans for the around-the-clock bombing of any target. In some cases, single missions have been considered to constitute strategic bombing. The bombing of Peenemünde

12615-403: The conflict well into 1941. In December 1940, Roosevelt accused Hitler of planning world conquest and ruled out any negotiations as useless, calling for the United States to become an " arsenal of democracy " and promoting Lend-Lease programmes of military and humanitarian aid to support the British war effort; Lend-Lease was later extended to the other Allies, including the Soviet Union after it

12760-526: The creation of a " New Roman Empire ". Adolf Hitler , after an unsuccessful attempt to overthrow the German government in 1923, eventually became the Chancellor of Germany in 1933 when Paul von Hindenburg and the Reichstag appointed him. Following Hindenburg's death in 1934, Hitler proclaimed himself Führer of Germany and abolished democracy, espousing a radical, racially motivated revision of

12905-684: The deaths of civilians may also be described as such, or if the attacks involve fighters strafing they may be labelled "terror attacks". German propaganda minister Joseph Goebbels and other high-ranking officials of Nazi Germany frequently described attacks by the Royal Air Force (RAF) and the United States Army Air Forces (USAAF) during their strategic bombing campaigns as Terrorangriffe —terror attacks. The Allied governments usually described their bombing of cities with euphemisms such as area bombing (RAF) or precision bombing (USAAF), and for most of World War II

13050-410: The detachment radius) of communications, their indifference to obstacles, and the unlikelihood of casualties to air personnel combine to encourage their use offensively more often than the occasion warrants. In British strikes over Yemen in over a six-month period, sixty tons of bombs were dropped in over 1,200 cumulative flying hours. By August 1928, total losses in ground fighting and air attack, on

13195-547: The directive to prepare for an invasion of the Soviet Union. Strategic bombing One of the strategies of war is to demoralize the enemy so that peace or surrender becomes preferable to continuing the conflict. Strategic bombing has been used to this end. The phrase "terror bombing" entered the English lexicon towards the end of World War II and many strategic bombing campaigns and individual raids have been described as terror bombing by commentators and historians. Because

13340-757: The dissolution of the Austro-Hungarian, Ottoman, and Russian Empires. To prevent a future world war, the League of Nations was established in 1920 by the Paris Peace Conference . The organisation's primary goals were to prevent armed conflict through collective security, military, and naval disarmament , as well as settling international disputes through peaceful negotiations and arbitration. Despite strong pacifist sentiment after World War   I , irredentist and revanchist nationalism had emerged in several European states. These sentiments were especially marked in Germany because of

13485-662: The end of May completed the German conquest of the Balkans. Partisan warfare subsequently broke out against the Axis occupation of Yugoslavia , which continued until the end of the war. In the Middle East in May, Commonwealth forces quashed an uprising in Iraq which had been supported by German aircraft from bases within Vichy-controlled Syria . Between June and July, British-led forces invaded and occupied

13630-510: The end of World War II, but because the term has pejorative connotations, others have denied that such bombing campaigns and raids are examples of "terror bombing". Defensive measures against air raids include: Strategic bombing was used in World War I, though it was not understood in its present form. The first aerial bombing of a city was on 6 August 1914 when the German Army Zeppelin Z VI bombed, with artillery shells,

13775-511: The end of the war. World War II changed the political alignment and social structure of the world, and it set the foundation of international relations for the rest of the 20th century and into the 21st century. The United Nations was established to foster international cooperation and prevent conflicts, with the victorious great powers—China, France, the Soviet Union, the UK, and the US—becoming

13920-430: The enemy; facing continual death and destruction may make the prospect of peace or surrender preferable. The proponents of strategic bombing between the world wars, such as General Douhet, expected that direct attacks upon an enemy country's cities by strategic bombers would lead to a rapid collapse of civilian morale so that political pressure to sue for peace would lead to a rapid conclusion. When such attacks were tried in

14065-436: The first independent strategic bombing force, was created in April 1918. By the end of the war, the force had aircraft that could reach Berlin , but these were never used. Following the war, the concept of strategic bombing developed. Calculations of the number of dead to the weight of bombs would have a profound effect on the attitudes of the British authorities and population in the interwar years. As bombers became larger, it

14210-575: The first step of what its government saw as the country's right to rule Asia , staged the Mukden incident as a pretext to invade Manchuria and establish the puppet state of Manchukuo . China appealed to the League of Nations to stop the Japanese invasion of Manchuria. Japan withdrew from the League of Nations after being condemned for its incursion into Manchuria. The two nations then fought several battles, in Shanghai , Rehe and Hebei , until

14355-452: The following two decades fighting for survival in an environment of severe government spending constraints. In Italy, the airpower prophet General Giulio Douhet asserted the basic principle of strategic bombing was the offensive, and there was no defense against carpet bombing and poison gas attacks. The seeds of Douhet's apocalyptic predictions found fertile soil in France, Germany, and

14500-406: The force of four aircraft inflicted minor damage on the sheds. The raid was repeated a month later with slightly more success. Within a year or so, specialized aircraft and dedicated bomber squadrons were in service on both sides. These were generally used for tactical bombing; the aim was that of directly harming enemy troops, strongpoints, or equipment, usually within a relatively small distance of

14645-864: The former Chinese imperial capital of Peking after instigating the Marco Polo Bridge incident , which culminated in the Japanese campaign to invade all of China. The Soviets quickly signed a non-aggression pact with China to lend materiel support, effectively ending China's prior cooperation with Germany . From September to November, the Japanese attacked Taiyuan , engaged the Kuomintang Army around Xinkou , and fought Communist forces in Pingxingguan . Generalissimo Chiang Kai-shek deployed his best army to defend Shanghai , but after three months of fighting, Shanghai fell. The Japanese continued to push Chinese forces back, capturing

14790-463: The front line. Eventually, attention turned to the possibility of causing indirect harm to the enemy by systematically attacking vital rear-area resources. The most well known attacks were those done by Zeppelins over England through the course of the war. The first aerial bombardment of English civilians was on January 19, 1915, when two Zeppelins dropped 24 fifty-kilogram (110-pound) high-explosive bombs and ineffective three-kilogram incendiaries on

14935-525: The invasion of the Ethiopian Empire (also known as Abyssinia ) by the armed forces of the Kingdom of Italy ( Regno d'Italia ), which was launched from Italian Somaliland and Eritrea . The war resulted in the military occupation of Ethiopia and its annexation into the newly created colony of Italian East Africa ( Africa Orientale Italiana , or AOI); in addition it exposed the weakness of

15080-843: The issue and a longtime opponent of strategic bombing, Richard Stokes MP , asked questions in the House of Commons on 6 March. The controversy stirred up by the Cowan news report reached the highest levels of the British Government when on 28 March 1945 the Prime Minister, Winston Churchill , sent a memo by telegram to General Ismay for the British Chiefs of Staff and the Chief of the Air Staff in which he started with

15225-682: The latter enabling the strategic bombing of population centres and delivery of the only two nuclear weapons ever used in war. World War II was the deadliest conflict in history, resulting in 70 to 85 million deaths , more than half being civilians. Millions died in genocides , including the Holocaust of European Jews, as well as from massacres, starvation, and disease. Following the Allied powers' victory, Germany , Austria , Japan , and Korea were occupied, and war crimes tribunals were conducted against German and Japanese leaders . The causes of World War II included unresolved tensions in

15370-454: The mighty bombers. In support of this theory, he argued for targeting of the civilian population as much as any military target, since a nation's morale was as important a resource as its weapons. Paradoxically, he suggested that this would actually reduce total casualties, since "The time would soon come when to put an end to horror and suffering, the people themselves, driven by the instinct of self-preservation, would rise up and demand an end to

15515-710: The only answers—a later generation would revisit this, as Mutual Assured Destruction . During the interwar period (1919–1939), the use of aerial bombing was developed as part of British foreign policy in its colonies, with Hugh Trenchard as its leading proponent, Sir Charles Portal , Sir Arthur Harris , and Sidney Bufton . The Trenchard School theories were successfully put into action in Mesopotamia (modern-day Iraq ) where RAF bombers used high-explosive bombs and strafing runs against Arab forces. The techniques of so-called "Air Control" also included target marking and locating, as well as formation flying. Arthur Harris ,

15660-447: The permanent members of its security council . The Soviet Union and the United States emerged as rival superpowers , setting the stage for the Cold War . In the wake of European devastation, the influence of its great powers waned, triggering the decolonisation of Africa and Asia . Most countries whose industries had been damaged moved towards economic recovery and expansion . World War II began in Europe on 1 September 1939 with

15805-589: The political European map with the defeat of the Central Powers —including Austria-Hungary , Germany , Bulgaria , and the Ottoman Empire —and the 1917 Bolshevik seizure of power in Russia , which led to the founding of the Soviet Union. Meanwhile, the victorious Allies of World War I , such as France, Belgium, Italy, Romania, and Greece, gained territory, and new nation-states were created out of

15950-599: The port of Tobruk . By late March 1941, Bulgaria and Yugoslavia signed the Tripartite Pact ; however, the Yugoslav government was overthrown two days later by pro-British nationalists. Germany and Italy responded with simultaneous invasions of both Yugoslavia and Greece , commencing on 6 April 1941; both nations were forced to surrender within the month. The airborne invasion of the Greek island of Crete at

16095-531: The raid also helped destroy "what is left of German morale." Howard Cowan, an Associated Press war correspondent, filed a story about the Dresden raid. The military press censor at SHAEF made a mistake and allowed the Cowan cable to go out starting with "Allied air bosses have made the long awaited decision to adopt deliberate terror bombing of great German population centers as a ruthless expedient to hasten Hitler's doom." There were follow-up newspaper editorials on

16240-722: The remainder of Czechoslovakia and subsequently split it into the German Protectorate of Bohemia and Moravia and a pro-German client state , the Slovak Republic . Hitler also delivered an ultimatum to Lithuania on 20 March 1939, forcing the concession of the Klaipėda Region , formerly the German Memelland . Greatly alarmed and with Hitler making further demands on the Free City of Danzig ,

16385-448: The scatter of bombs was likely to be considerable. Add to these difficulties the disruptive effects of increasingly accurate anti-aircraft fire and head-on attacks by fighter aircraft and the theoretical accuracy of daylight bombing was often hard to achieve. Accuracy, described as "pinpoint", never exceeded the best British average of about a 3 mi (4.8 km) radius from point of aim in any case. Postwar German engineers considered

16530-576: The sentence "It seems to me that the moment has come when the question of bombing of German cities simply for the sake of increasing the terror, though under other pretexts, should be reviewed...." Under pressure from the Chiefs of Staff and in response to the views expressed by Chief of the Air Staff Sir Charles Portal , and the head of Bomber Command, Arthur "Bomber" Harris , among others, Churchill withdrew his memo and issued

16675-410: The significant territorial, colonial, and financial losses imposed by the Treaty of Versailles . Under the treaty, Germany lost around 13 percent of its home territory and all its overseas possessions , while German annexation of other states was prohibited, reparations were imposed, and limits were placed on the size and capability of the country's armed forces . The German Empire was dissolved in

16820-498: The start or prelude to World War II. The exact date of the war's end also is not universally agreed upon. It was generally accepted at the time that the war ended with the armistice of 15 August 1945 ( V-J Day ), rather than with the formal surrender of Japan on 2 September 1945, which officially ended the war in Asia . A peace treaty between Japan and the Allies was signed in 1951. A 1990 treaty regarding Germany's future allowed

16965-611: The strategic bombing in a bigger way than the RFC, who were focused on supporting the infantry actions of the Western Front. At first, the RNAS attacked the German submarines in their moorings and then steelworks further in targeting the origin of the submarines themselves. In early 1918 they operated their "round the clock" bombing raid, with lighter bombers attacking the town of Trier by day and large HP O/400s attacking by night. The Independent Force , an expanded bombing group, and

17110-593: The strong Maginot Line fortifications on the Franco-German border, Germany directed its attack at the neutral nations of Belgium , the Netherlands , and Luxembourg . The Germans carried out a flanking manoeuvre through the Ardennes region, which was mistakenly perceived by the Allies as an impenetrable natural barrier against armoured vehicles. By successfully implementing new Blitzkrieg tactics,

17255-508: The tactic's potential as a weapon that was of use for propagandists on both sides. The late Zeppelin raids were complemented by the Gotha bomber, which was the first heavier-than-air bomber to be used for strategic bombing. The French army on June 15, 1915, attacked the German town of Karlsruhe , killing 29 civilians and wounding 58. Further raids followed until the Armistice in 1918. In

17400-450: The target in waves. Nowadays, a large bomber or missile can be used to the same effect on a small area (an airfield, for example) by releasing a relatively large number of smaller bombs. Strategic bombing campaigns were conducted in Europe and Asia. The Germans and Japanese made use of mostly twin-engined bombers with a payload generally less than 5,000 pounds (2,300 kg), and never produced larger craft to any great extent. By comparison,

17545-470: The term has pejorative connotations, some, including the Allies of World War II , have preferred to use euphemisms such as "will to resist" and "morale bombings". The theoretical distinction between tactical and strategic air warfare was developed between the two world wars. Some leading theorists of strategic air warfare during this period were the Italian Giulio Douhet , the Trenchard school in

17690-404: The times remained " the bomber will always get through ". These theorists for strategic bombing argued that it would be necessary to develop a fleet of strategic bombers during peacetime, both to deter any potential enemy, and also in the case of a war, to be able to deliver devastating attacks on the enemy industries and cities while suffering from relatively few friendly casualties before victory

17835-406: The toll of many innocent lives. Should We continue to fight, it would not only result in an ultimate collapse and obliteration of the Japanese nation but also it would lead to the total extinction of human civilization. Such being the case, how are We to save the millions of Our subjects; or to atone Ourselves before the hallowed spirits of Our Imperial Ancestors? This is the reason why We have ordered

17980-518: The two wars became World War II in 1941. Other proposed starting dates for World War II include the Italian invasion of Abyssinia on 3 October 1935. The British historian Antony Beevor views the beginning of World War   II as the Battles of Khalkhin Gol fought between Japan and the forces of Mongolia and the Soviet Union from May to September 1939. Others view the Spanish Civil War as

18125-574: The unique ability of a modern air force to win wars by unaided strategic bombing. As the speed and altitude of bombers increased in proportion to fighter aircraft, the prevailing strategic understanding became "the bomber will always get through". Although anti-aircraft guns and fighter aircraft had proved effective in the Great War, it was accepted there was little warring nations could do to prevent massive civilian casualties from strategic bombing . High civilian morale and retaliation in kind were seen as

18270-513: The war were not fulfilled in the peace settlement. From 1922 to 1925, the Fascist movement led by Benito Mussolini seized power in Italy with a nationalist, totalitarian , and class collaborationist agenda that abolished representative democracy, repressed socialist, left-wing, and liberal forces, and pursued an aggressive expansionist foreign policy aimed at making Italy a world power, promising

18415-570: The war, when Germany invaded Poland on 1 September 1939. A strategic-bombing campaign was launched by the Germans as a precursor to the invasion of the United Kingdom to force the RAF to engage the Luftwaffe and so be destroyed either on the ground or in the air. That tactic failed, and the RAF began bombing German cities on 11 May 1940. After the Battle of Britain , the Germans launched their night time Blitz hoping to break British morale and to have

18560-475: The war. Germany annexed western Poland and occupied central Poland ; the Soviet Union annexed eastern Poland ; small shares of Polish territory were transferred to Lithuania and Slovakia . On 6 October, Hitler made a public peace overture to the United Kingdom and France but said that the future of Poland was to be determined exclusively by Germany and the Soviet Union. The proposal was rejected and Hitler ordered an immediate offensive against France, which

18705-431: The war...". As a result of Douhet's proposals, air forces allocated greater resources to their bomber squadrons than to their fighters, and the 'dashing young pilots' promoted in the propaganda of the time were invariably bomber pilots. Royal Air Force leaders, in particular Air Chief Marshal Hugh Trenchard , believed the key to retaining their independence from the senior services was to lay stress on what they saw as

18850-512: The west halted the German advance for several days, but it was outflanked and encircled by the Wehrmacht . Remnants of the Polish army broke through to besieged Warsaw . On 17 September 1939, two days after signing a cease-fire with Japan , the Soviet Union invaded Poland under the supposed pretext that the Polish state had ceased to exist. On 27 September, the Warsaw garrison surrendered to

18995-449: The women and children as far as possible, and for this purpose, a warning should be given, whenever practicable. It would be wrong even at this stage to think that airpower was simply seen as a tool for rapid retribution. A statement clearly pointed out that the ability of aircraft to inflict punishment could be open to abuse: Their power to cover great distances at high speed, their instant readiness for action, their independence (within

19140-707: The world order , and soon began a massive rearmament campaign . France, seeking to secure its alliance with Italy, allowed Italy a free hand in Ethiopia , which Italy desired as a colonial possession. The situation was aggravated in early 1935 when the Territory of the Saar Basin was legally reunited with Germany, and Hitler repudiated the Treaty of Versailles, accelerated his rearmament programme, and introduced conscription. The United Kingdom, France and Italy formed

19285-614: Was invaded by Germany. The United States started strategic planning to prepare for a full-scale offensive against Germany. At the end of September 1940, the Tripartite Pact formally united Japan, Italy, and Germany as the Axis powers . The Tripartite Pact stipulated that any country—with the exception of the Soviet Union—that attacked any Axis Power would be forced to go to war against all three. The Axis expanded in November 1940 when Hungary , Slovakia , and Romania joined. Romania and Hungary later made major contributions to

19430-544: Was accidentally bombed in May, and in July the Kaiser allowed directed raids against urban centers. There were 23 airship raids in 1916, in which 125 tons of ordnance were dropped, killing 293 people and injuring 691. Gradually British air defenses improved. In 1917 and 1918, there were only 11 Zeppelin raids against England, and the final raid occurred on August 5, 1918, which resulted in the death of KK Peter Strasser , commander of

19575-433: Was achieved. In the period between the two world wars, military thinkers from several nations advocated strategic bombing as the logical and obvious way to employ aircraft. Domestic political considerations saw to it that the British worked harder on the concept than most. The British Royal Flying Corps and Royal Naval Air Service of the Great War had been merged in 1918 to create a separate air force, which spent much of

19720-411: Was fully expected that deaths would dramatically increase. The fear of aerial attack on such a scale was one of the fundamental driving forces of the appeasement of Nazi Germany in the 1930s. These early developments of aerial warfare led to two distinct branches in the writings of air warfare theorists: tactical air warfare and strategic air warfare. Tactical air warfare was developed as part of

19865-456: Was postponed until the spring of 1940 due to bad weather. After the outbreak of war in Poland, Stalin threatened Estonia , Latvia , and Lithuania with military invasion, forcing the three Baltic countries to sign pacts allowing the creation of Soviet military bases in these countries; in October 1939, significant Soviet military contingents were moved there. Finland refused to sign

20010-772: Was repulsed with heavy Italian casualties; the campaign ended within months with minor territorial changes. To assist Italy and prevent Britain from gaining a foothold, Germany prepared to invade the Balkans, which would threaten Romanian oil fields and strike against British dominance of the Mediterranean. In December 1940, British Empire forces began counter-offensives against Italian forces in Egypt and Italian East Africa . The offensives were successful; by early February 1941, Italy had lost control of eastern Libya, and large numbers of Italian troops had been taken prisoner. The Italian Navy also suffered significant defeats, with

20155-557: Was required to go through the bureaucracy of the League of Nations, which rendered it essentially toothless. The United States, concerned with events in Europe and Asia, passed the Neutrality Act in August of the same year. Hitler defied the Versailles and Locarno Treaties by remilitarising the Rhineland in March 1936, encountering little opposition due to the policy of appeasement . In October 1936, Germany and Italy formed

20300-536: Was required, the smaller Japanese bombers (in comparison to British and American types) did not carry a bombload sufficient to inflict the sort of damage regularly occurring at that point in the war in Europe, or later in Japan. The development of the B-29 gave the United States a bomber with sufficient range to reach the Japanese home islands from the safety of American bases in the Pacific or western China. The capture of

20445-428: Was still disarmed and France was Britain's only European rival, Trenchard boasted, "the French in a bombing duel would probably squeal before we did". At the time, the expectation was any new war would be brief and very brutal. A British Cabinet planning document in 1938 predicted that, if war with Germany broke out, 35% of British homes would be hit by bombs in the first three weeks. This type of expectation would justify

20590-543: Was such an event, as was the bombing of the Ruhr dams . The Peenemünde mission delayed Nazi Germany's V-2 program enough that it did not become a major factor in the outcome of the war. Soviet Air Forces conducted strategic bombings of Helsinki , the capital of Finland , between 1939 and 1944, with Finland being subjected to a number of bombing campaigns by the USSR in that period. The largest were three raids in February 1944, which have been called The Great Raids Against Helsinki . The Finnish Air Force responded to

20735-423: Was the use of nuclear weapons. On August 6 and 9, 1945, the United States exploded nuclear bombs over Hiroshima and Nagasaki, killing 105,000 people and inflicting a psychological shock on the Japanese nation. On August 15, Emperor Hirohito announced the surrender of Japan , stating : Moreover, the enemy has begun to employ a new and most cruel bomb, the power of which to do damage is indeed incalculable, taking

20880-442: Was to come in the near future. Yet the theory that " the bomber will always get through " started to appear doubtful, as stated by the U.S.  Attaché in 1937, "The peacetime theory of the complete invulnerability of the modern type of bombardment airplane no longer holds. The increased speeds of both the bombardment and pursuit plane have worked in favor of the pursuit ... The flying fortress died in Spain." Large scale bombing of

21025-451: Was withdrawn from service in 1944 and was replaced in training by examples of the actual aircraft in which the gunners would eventually serve. Many AT-21s were then relegated to target-tow duties. A small number of AT-21s survived as civilian examples, with one (s/n 42-48053 owned by Craig Cantwell) still in existence in North Texas awaiting restoration. In October 1942, the U.S. Army Air Forces ordered two XBQ-3 "aerial torpedoes", based on

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