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104-892: The Befehlshaber der Unterseeboote or BdU (Eng: "Commander of the U-boats ") was the supreme commander of the German Navy's U-boat Arm ( Ubootwaffe ) during the First and Second World Wars . The term also referred to the Command HQ of the U-boat arm. The title was established in June 1917, replacing the role of "Leader of the U-boats" ( Führer der Unterseeboote , or FdU) for the High Seas Flotillas. The first incumbent

208-645: A blue-water navy was vital for global power projection; Tirpitz had his books translated into German, while Wilhelm made them required reading for his advisors and senior military personnel. However, it was also an emotional decision, driven by Wilhelm's simultaneous admiration for the Royal Navy and desire to surpass it. Bismarck thought that the British would not interfere in Europe, as long as its maritime supremacy remained secure, but his dismissal in 1890 led to

312-592: A grenade at the Archduke's car and injured two of his aides. The other assassins were also unsuccessful. An hour later, as Ferdinand was returning from visiting the injured officers in hospital, his car took a wrong turn into a street where Gavrilo Princip was standing. He fired two pistol shots, fatally wounding Ferdinand and his wife Sophie . According to historian Zbyněk Zeman , in Vienna "the event almost failed to make any impression whatsoever. On 28 and 29 June,

416-540: A guerrilla warfare campaign and only surrendered two weeks after the armistice took effect in Europe. Before the war, Germany had attempted to use Indian nationalism and pan-Islamism to its advantage, a policy continued post-1914 by instigating uprisings in India , while the Niedermayer–Hentig Expedition urged Afghanistan to join the war on the side of Central Powers. However, contrary to British fears of

520-408: A change in policy and an Anglo-German naval arms race began. Despite the vast sums spent by Tirpitz, the launch of HMS  Dreadnought in 1906 gave the British a technological advantage. Ultimately, the race diverted huge resources into creating a German navy large enough to antagonise Britain, but not defeat it; in 1911, Chancellor Theobald von Bethmann Hollweg acknowledged defeat, leading to

624-613: A direct threat. The 1908–1909 Bosnian Crisis began when Austria annexed the former Ottoman territory of Bosnia and Herzegovina , which it had occupied since 1878. Timed to coincide with the Bulgarian Declaration of Independence from the Ottoman Empire, this unilateral action was denounced by the European powers, but accepted as there was no consensus on how to resolve the situation. Some historians see this as

728-471: A gap between the German armies as they closed on Paris. The French army, reinforced by the British expeditionary corps, seized this opportunity to counter-attack and pushed the German army 40 to 80 km back. Both armies were then so exhausted that no decisive move could be implemented, so they settled in trenches, with the vain hope of breaking through as soon as they could build local superiority. In 1911,

832-548: A possibility. This was accentuated by British and Russian support for France against Germany during the 1911 Agadir Crisis . German economic and industrial strength continued to expand rapidly post-1871. Backed by Wilhelm II, Admiral Alfred von Tirpitz sought to use this growth to build an Imperial German Navy , that could compete with the British Royal Navy . This policy was based on the work of US naval author Alfred Thayer Mahan , who argued that possession of

936-528: A result of the Serbian revolution which lasted between 1804 and 1817. Despite brutal oppression and retaliation by the Ottoman authorities, the revolutionary leaders, first Karađorđe and then Miloš Obrenović , succeeded in their goal to liberate Serbia after centuries of Turkish rule. At first, the principality included only the territory of the former Pashaluk of Belgrade , but in 1831–1833 it expanded to

1040-649: A result of the multi-ethnic composition of Kosovo, the new administrations provoked a mixed response from the local population. Serbs considered this a liberation. On November 29, 1913, the Drač County of the Kingdom of Serbia was established on the part of the territory of Albania taken from the Ottoman Empire during the First Balkan War. Serbian Drač County had four districts ( Serbian : срез ): Drač (Durrës), Lješ (Lezhë), Elbasan and Tirana . After

1144-834: A revolt in India, the outbreak of the war saw a reduction in nationalist activity. Leaders from the Indian National Congress and other groups believed support for the British war effort would hasten Indian Home Rule , a promise allegedly made explicit in 1917 by Edwin Montagu , the Secretary of State for India . In 1914, the British Indian Army was larger than the British Army itself, and between 1914 and 1918 an estimated 1.3 million Indian soldiers and labourers served in Europe, Africa, and

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1248-516: A significant escalation, ending any chance of Austria cooperating with Russia in the Balkans, while also damaging diplomatic relations between Serbia and Italy. Tensions increased after the 1911–1912 Italo-Turkish War demonstrated Ottoman weakness and led to the formation of the Balkan League , an alliance of Serbia, Bulgaria, Montenegro , and Greece . The League quickly overran most of

1352-478: A war on two fronts; the Schlieffen Plan envisaged using 80% of the army to defeat France, then switching to Russia. Since this required them to move quickly, mobilization orders were issued that afternoon. Once the German ultimatum to Russia expired on the morning of 1 August, the two countries were at war. At a meeting on 29 July, the British cabinet had narrowly decided its obligations to Belgium under

1456-402: A weak Ottoman government, rather than an ambitious Slav power like Bulgaria . Russia had ambitions in northeastern Anatolia while its clients had overlapping claims in the Balkans. These competing interests divided Russian policy-makers and added to regional instability. Austrian statesmen viewed the Balkans as essential for the continued existence of their Empire and saw Serbian expansion as

1560-455: A whole, the Somme offensive led to an estimated 420,000 British casualties, along with 200,000 French and 500,000 Germans. The diseases that emerged in the trenches were a major killer on both sides. The living conditions led to disease and infection, such as trench foot , lice , typhus , trench fever , and the ' Spanish flu '. At the start of the war, German cruisers were scattered across

1664-508: Is known, however, that from 1908 to 1913, military spending by the six major European powers increased by over 50% in real terms. The years before 1914 were marked by a series of crises in the Balkans, as other powers sought to benefit from the Ottoman decline. While Pan-Slavic and Orthodox Russia considered itself the protector of Serbia and other Slav states, they preferred the strategically vital Bosporus straits to be controlled by

1768-574: The Schutzkorps was established, and carried out the persecution of Serbs. The assassination initiated the July Crisis, a month of diplomatic manoeuvring between Austria-Hungary, Germany, Russia, France and Britain. Believing that Serbian intelligence helped organise Franz Ferdinand's murder, Austrian officials wanted to use the opportunity to end their interference in Bosnia and saw war as

1872-641: The World War . In August 1914, the magazine The Independent wrote "This is the Great War. It names itself". In October 1914, the Canadian magazine Maclean's similarly wrote, "Some wars name themselves. This is the Great War." Contemporary Europeans also referred to it as " the war to end war " and it was also described as "the war to end all wars" due to their perception of its unparalleled scale, devastation, and loss of life. The first recorded use of

1976-567: The Annexation crisis ) erupted into public view when on October 5, 1908, the Kingdom of Bulgaria declared its complete independence from Ottoman Empire and on October 6, 1908, when Austria-Hungary announced the annexation of Bosnia and Herzegovina , which was populated mainly by South Slavs . Austria-Hungary had ambitions of imperialistic expansion and saw the Balkans in the same way that other colonial powers saw Africa or Asia. This idea

2080-695: The Australian Naval and Military Expeditionary Force landed on the island of New Britain , then part of German New Guinea . On 28 October, the German cruiser SMS  Emden sank the Russian cruiser Zhemchug in the Battle of Penang . Japan declared war on Germany before seizing territories in the Pacific, which later became the South Seas Mandate , as well as German Treaty ports on

2184-526: The First Balkan War of 1912, territories of Kosovo and north-western Macedonia were internationally recognised as a part of Serbia and northern Metohija as a part of Montenegro at the Treaty of London of May 1913. In a report to Rome , Lazër Mjeda , Archbishop of Skopje, estimated that 25,000 Albanians were killed by Serbian forces during and after the conflict. The old disagreements regarding

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2288-787: The Great Exoduses of the Serbs , in 1690 and in 18th century, between 1718 and 1739, from various territories under the rule of the Ottoman Empire , particularly the Kosovo Vilayet, to the Kingdom of Hungary under the Habsburg monarchy . As a result, from 1830 to 1876, it has been estimated that up to 150,000 Albanians that lived in the territories of the Principality of Serbia emigrated or were expelled . In 1867

2392-582: The Kingdom of Serbs, Croats and Slovenes . The new country continued to be ruled by the Serbian monarchy when in August 1921 Prince Alexandar I became king. In 1888 People's Radical Party led by Sava Grujić and Nikola Pašić came to power and a new constitution , based on the liberal Constitution of Belgium was introduced. The lost war and the Radical Party's total electoral victory were some of

2496-465: The Ottoman army garrisons retreated from the Principality, securing its de facto independence. Serbia expanded further to the south-east in 1878, when it won full international recognition at the Congress of Berlin . After the 1877–1878 expansion, in the new areas (present-day Jablanica , Toplica and parts of Nišava District ) an estimated 49,000–130,000 Albanians were expelled ( Expulsion of

2600-591: The Republic of North Macedonia but land-locked Serbia was prevented from gaining access to the Adriatic Sea by the newly established Principality of Albania . As the result of these wars, Serbia's population increased from 2.9 million to 4.5 million and territory increased by 81%. The assassination of Archduke Franz Ferdinand of Austria on 28 June 1914 in Sarajevo (then part of Austria-Hungary ) brought

2704-721: The Rüstungswende or 'armaments turning point', when he switched expenditure from the navy to the army. This decision was not driven by a reduction in political tensions but by German concern over Russia's quick recovery from its defeat in the Russo-Japanese War and subsequent 1905 Russian Revolution . Economic reforms led to a significant post-1908 expansion of railways and transportation infrastructure, particularly in its western border regions. Since Germany and Austria-Hungary relied on faster mobilisation to compensate for their numerical inferiority compared to Russia,

2808-828: The United States entered the war on the Allied side following Germany's resumption of unrestricted submarine warfare against Atlantic shipping. Later that year, the Bolsheviks seized power in the Russian October Revolution , and Soviet Russia signed an armistice with the Central Powers in December, followed by a separate peace in March 1918. That month, Germany launched an offensive in

2912-487: The hydrophone and depth charges were introduced, destroyers could potentially successfully attack a submerged submarine. Convoys slowed the flow of supplies since ships had to wait as convoys were assembled; the solution was an extensive program of building new freighters. Troopships were too fast for the submarines and did not travel the North Atlantic in convoys. The U-boats sunk more than 5,000 Allied ships, at

3016-821: The tank . After the First Battle of the Marne in September 1914, Allied and German forces unsuccessfully tried to outflank each other, a series of manoeuvres later known as the " Race to the Sea ". By the end of 1914, the opposing forces confronted each other along an uninterrupted line of entrenched positions from the Channel to the Swiss border. Since the Germans were normally able to choose where to stand, they generally held

3120-588: The 1839 Treaty of London did not require it to oppose a German invasion with military force; however, Prime Minister Asquith and his senior Cabinet ministers were already committed to supporting France, the Royal Navy had been mobilised, and public opinion was strongly in favour of intervention. On 31 July, Britain sent notes to Germany and France, asking them to respect Belgian neutrality; France pledged to do so, but Germany did not reply. Aware of German plans to attack through Belgium, French Commander-in-Chief Joseph Joffre asked his government for permission to cross

3224-563: The 1879 Dual Alliance , which became the Triple Alliance when Italy joined in 1882. For Bismarck, the purpose of these agreements was to isolate France by ensuring the three Empires resolve any disputes between themselves. In 1887, Bismarck set up the Reinsurance Treaty , a secret agreement between Germany and Russia to remain neutral if either were attacked by France or Austria-Hungary. For Bismarck, peace with Russia

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3328-441: The 1913 Treaty of London , which had created an independent Albania while enlarging the territories of Bulgaria, Serbia, Montenegro and Greece. However, disputes between the victors sparked the 33-day Second Balkan War , when Bulgaria attacked Serbia and Greece on 16 June 1913; it was defeated, losing most of Macedonia to Serbia and Greece, and Southern Dobruja to Romania. The result was that even countries which benefited from

3432-633: The Albanians 1877–1878 ), settling mainly in Kosovo. These events marked the beginning of the Serbian-Albanian conflict . The Serbo-Bulgarian War erupted on November 14, 1885, and lasted until November 28 of the same year. The war ended in defeat for Serbia, as it had failed to capture the Slivnitsa region which it had set out to achieve. Bulgarians successfully repelled the Serbs after

3536-514: The Austrians and Serbs clashed at the battles of the Cer and Kolubara ; over the next two weeks, Austrian attacks were repulsed with heavy losses. As a result, Austria had to keep sizeable forces on the Serbian front, weakening their efforts against Russia. Serbia's victory against Austria-Hungary in the 1914 invasion has been called one of the major upset victories of the twentieth century. In 1915,

3640-646: The Austrians briefly occupied the Serbian capital, Belgrade . A Serbian counter-attack in the Battle of Kolubara succeeded in driving them from the country by the end of 1914. For the first 10 months of 1915, Austria-Hungary used most of its military reserves to fight Italy. German and Austro-Hungarian diplomats scored a coup by persuading Bulgaria to join the attack on Serbia. The Austro-Hungarian provinces of Slovenia , Croatia and Bosnia provided troops for Austria-Hungary. Montenegro allied itself with Serbia. Bulgaria declared war on Serbia on 14 October 1915 and joined in

3744-553: The Balkan Wars, such as Serbia and Greece, felt cheated of their "rightful gains", while for Austria it demonstrated the apparent indifference with which other powers viewed their concerns, including Germany. This complex mix of resentment, nationalism and insecurity helps explain why the pre-1914 Balkans became known as the " powder keg of Europe ". On 28 June 1914, Archduke Franz Ferdinand of Austria , heir presumptive to Emperor Franz Joseph I of Austria , visited Sarajevo ,

3848-404: The Central Powers. However, the pro-German King Constantine I dismissed the pro-Allied government of Eleftherios Venizelos before the Allied expeditionary force arrived. The Macedonian front was at first mostly static. French and Serbian forces retook limited areas of Macedonia by recapturing Bitola on 19 November 1916 following the costly Monastir offensive , which brought stabilisation of

3952-649: The Chinese Shandong peninsula at Tsingtao . After Vienna refused to withdraw its cruiser SMS  Kaiserin Elisabeth from Tsingtao, Japan declared war on Austria-Hungary, and the ship was sunk in November 1914. Within a few months, Allied forces had seized all German territories in the Pacific, leaving only isolated commerce raiders and a few holdouts in New Guinea. Some of the first clashes of

4056-623: The German High Seas Fleet was confined to port. German U-boats attempted to cut the supply lines between North America and Britain. The nature of submarine warfare meant that attacks often came without warning, giving the crews of the merchant ships little hope of survival. The United States launched a protest, and Germany changed its rules of engagement. After the sinking of the passenger ship RMS Lusitania in 1915, Germany promised not to target passenger liners, while Britain armed its merchant ships, placing them beyond

4160-640: The German Army increased in size from 1908 to 1914, he changed the allocation of forces between the two wings to 70:30. He also considered Dutch neutrality essential for German trade and cancelled the incursion into the Netherlands, which meant any delays in Belgium threatened the viability of the plan. Historian Richard Holmes argues that these changes meant the right wing was not strong enough to achieve decisive success. The initial German advance in

4264-752: The German right wing would sweep through the Netherlands and Belgium , then swing south, encircling Paris and trapping the French army against the Swiss border. The plan's creator, Alfred von Schlieffen , head of the German General Staff from 1891 to 1906, estimated that this would take six weeks, after which the German army would transfer to the East and defeat the Russians. The plan was substantially modified by his successor, Helmuth von Moltke

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4368-426: The Germans bled heavily as well, with anywhere from 700,000 to 975,000 casualties between the two combatants. Verdun became a symbol of French determination and self-sacrifice. The Battle of the Somme was an Anglo-French offensive from July to November 1916. The opening day on 1 July 1916 was the bloodiest single day in the history of the British Army , which suffered 57,500 casualties, including 19,200 dead. As

4472-409: The Kriegsmarine in 1943 and was given command of U-1232 taking it out on one patrol before becoming chief of staff at BdU. Beucke was withdrawn from command of U-boat (a single patrol with German submarine  U-173 ) in 1942 because his brothers had been killed. First World War World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War ,

4576-565: The Middle East. In all, 140,000 soldiers served on the Western Front and nearly 700,000 in the Middle East, with 47,746 killed and 65,126 wounded. The suffering engendered by the war, as well as the failure of the British government to grant self-government to India afterward, bred disillusionment, resulting in the campaign for full independence led by Mahatma Gandhi . Pre-war military tactics that had emphasised open warfare and individual riflemen proved obsolete when confronted with conditions prevailing in 1914. Technological advances allowed

4680-439: The Obrenović family were shot as well. This act resulted in the extinction of the House of Obrenović , which had been ruling Serbia since 1817. After the May Coup the Serbian Skupština invited Peter Karađorđević to assume the Serbian crown as Peter I of Serbia . A constitutional monarchy was created with the military Black Hand society operating behind the scenes. The traditionally good relations with Austria-Hungary ended, as

4784-545: The Ottomans joined the Central Powers in November. Germany's strategy in 1914 was to quickly defeat France, then to transfer its forces to the east, but its advance was halted in September , and by the end of the year the Western Front consisted of a continuous line of trenches stretching from the English Channel to Switzerland. The Eastern Front was more dynamic, but neither side gained a decisive advantage, despite costly offensives. Italy , Bulgaria , Romania , Greece and others joined in from 1915 onward. In April 1917,

4888-449: The Ottomans' territory in the Balkans during the 1912–1913 First Balkan War , much to the surprise of outside observers. The Serbian capture of ports on the Adriatic resulted in partial Austrian mobilisation, starting on 21 November 1912, including units along the Russian border in Galicia . The Russian government decided not to mobilise in response, unprepared to precipitate a war. The Great Powers sought to re-assert control through

4992-549: The Russian Stavka agreed with the French to attack Germany within fifteen days of mobilisation, ten days before the Germans had anticipated, although it meant the two Russian armies that entered East Prussia on 17 August did so without many of their support elements. By the end of 1914, German troops held strong defensive positions inside France, controlled the bulk of France's domestic coalfields, and inflicted 230,000 more casualties than it lost itself. However, communications problems and questionable command decisions cost Germany

5096-429: The Serbian retreat toward the Adriatic coast in the Battle of Mojkovac on 6–7 January 1916, but ultimately the Austrians also conquered Montenegro. The surviving Serbian soldiers were evacuated to Greece. After the conquest, Serbia was divided between Austro-Hungary and Bulgaria. In late 1915, a Franco-British force landed at Salonica in Greece to offer assistance and to pressure its government to declare war against

5200-455: The West was very successful. By the end of August, the Allied left, which included the British Expeditionary Force (BEF), was in full retreat , and the French offensive in Alsace-Lorraine was a disastrous failure, with casualties exceeding 260,000. German planning provided broad strategic instructions while allowing army commanders considerable freedom in carrying them out at the front, but von Kluck used this freedom to disobey orders, opening

5304-430: The Younger . Under Schlieffen, 85% of German forces in the west were assigned to the right wing, with the remainder holding along the frontier. By keeping his left-wing deliberately weak, he hoped to lure the French into an offensive into the "lost provinces" of Alsace-Lorraine , which was the strategy envisaged by their Plan XVII . However, Moltke grew concerned that the French might push too hard on his left flank and as

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5408-446: The aggressor, German Chancellor Bethmann Hollweg delayed the commencement of war preparations until 31 July. That afternoon, the Russian government were handed a note requiring them to "cease all war measures against Germany and Austria-Hungary" within 12 hours. A further German demand for neutrality was refused by the French who ordered general mobilization but delayed declaring war. The German General Staff had long assumed they faced

5512-475: The assassination, the conspirators were arrested in Bosnia-Herzegovina and tried in Sarajevo in October 1914. The political objective of the assassination was to break the southern Slav provinces off from the Austro-Hungarian Empire. Assassination of Archduke Franz Ferdinand triggered a chain of international events that embroiled Russia and the major European powers in the conflict. On July 28, 1914, Austria-Hungary declared war against Serbia. In 1915 Serbia

5616-407: The attack by the Austro-Hungarian army under Mackensen's army of 250,000 that was already underway. Serbia was conquered in a little more than a month, as the Central Powers, now including Bulgaria, sent in 600,000 troops in total. The Serbian army, fighting on two fronts and facing certain defeat, retreated into northern Albania . The Serbs suffered defeat in the Battle of Kosovo . Montenegro covered

5720-477: The best way of achieving this. However, the Foreign Ministry had no solid proof of Serbian involvement. On 23   July, Austria delivered an ultimatum to Serbia, listing ten demands made intentionally unacceptable to provide an excuse for starting hostilities. Serbia ordered general mobilization on 25   July, but accepted all the terms, except for those empowering Austrian representatives to suppress "subversive elements" inside Serbia, and take part in

5824-483: The border and pre-empt such a move. To avoid violating Belgian neutrality, he was told any advance could come only after a German invasion. Instead, the French cabinet ordered its Army to withdraw 10 km behind the German frontier, to avoid provoking war. On 2 August, Germany occupied Luxembourg and exchanged fire with French units when German patrols entered French territory; on 3   August, they declared war on France and demanded free passage across Belgium, which

5928-427: The campaign saw the first use of anti-aircraft warfare after an Austrian plane was shot down with ground-to-air fire, as well as the first medical evacuation by the Serbian army. Upon mobilisation, in accordance with the Schlieffen Plan , 80% of the German Army was located on the Western Front, with the remainder acting as a screening force in the East. Rather than a direct attack across their shared frontier,

6032-525: The capital of the recently annexed Bosnia and Herzegovina . Cvjetko Popović , Gavrilo Princip , Nedeljko Čabrinović , Trifko Grabež , Vaso Čubrilović ( Bosnian Serbs ) and Muhamed Mehmedbašić (from the Bosniaks community), from the movement known as Young Bosnia , took up positions along the Archduke's motorcade route, to assassinate him. Supplied with arms by extremists within the Serbian Black Hand intelligence organisation, they hoped his death would free Bosnia from Austrian rule. Čabrinović threw

6136-466: The chance of a decisive outcome, while it had failed to achieve the primary objective of avoiding a long, two-front war. As was apparent to several German leaders, this amounted to a strategic defeat; shortly after the First Battle of the Marne , Crown Prince Wilhelm told an American reporter "We have lost the war. It will go on for a long time but lost it is already." On 30 August 1914, New Zealand occupied German Samoa (now Samoa ). On 11 September,

6240-400: The collapse of Austria-Hungary , Serbia experienced a loss of 28 percent of its pre-war population and went through radical changes after the liberation, all within days. On November 28, 1918, it absorbed the Kingdom of Montenegro at the Podgorica Assembly . On December 1, 1918, Serbia united with the newly created State of Slovenes, Croats, and Serbs to form a new southern Slav state,

6344-414: The cost of 199 submarines. World War I also saw the first use of aircraft carriers in combat, with HMS  Furious launching Sopwith Camels in a successful raid against the Zeppelin hangars at Tondern in July 1918, as well as blimps for antisubmarine patrol. Faced with Russia in the east, Austria-Hungary could spare only one-third of its army to attack Serbia. After suffering heavy losses,

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6448-415: The creation of new independent states, including Poland , Finland , the Baltic states , Czechoslovakia , and Yugoslavia . The League of Nations was established to maintain world peace, but its failure to manage instability during the interwar period contributed to the outbreak of World War II in 1939. Before World War II , the events of 1914–1918 were generally known as the Great War or simply

6552-449: The creation of strong defensive systems largely impervious to massed infantry advances, such as barbed wire , machine guns and above all far more powerful artillery , which dominated the battlefield and made crossing open ground extremely difficult. Both sides struggled to develop tactics for breaching entrenched positions without heavy casualties. In time, technology enabled the production of new offensive weapons, such as gas warfare and

6656-738: The crisis to an end. The crisis permanently damaged relations between Austria-Hungary on the one hand and Russia and Serbia on the other. The annexation and reactions to the annexation were some of the contributing causes of World War I. In 1890, it was divided into 15 districts ( okruzi ) which were further divided into counties ( srezovi ). Cities of Belgrade and Niš had special administrative status. The districts were: Valjevo , Vranje , Kragujevac , Krajina , Kruševac , Morava , Pirot , Podrinje , Podunavlje , Požarevac , Rudnik , Timok , Toplica , Užice and Crna Reka . In 1912 and 1913 Serbia enlarged its territory after victorious First Balkan War . In August 1913, 11 new districts were formed in

6760-818: The crowds listened to music and drank wine, as if nothing had happened." Nevertheless, the impact of the murder of the heir to the throne was significant, and has been described by historian Christopher Clark as a "9/11 effect, a terrorist event charged with historic meaning, transforming the political chemistry in Vienna". Austro-Hungarian authorities encouraged subsequent anti-Serb riots in Sarajevo . Violent actions against ethnic Serbs were also organised outside Sarajevo, in other cities in Austro-Hungarian-controlled Bosnia and Herzegovina, Croatia and Slovenia. Austro-Hungarian authorities in Bosnia and Herzegovina imprisoned approximately 5,500 prominent Serbs, 700 to 2,200 of whom died in prison. A further 460 Serbs were sentenced to death. A predominantly Bosniak special militia known as

6864-407: The decisive victory at the Battle of Slivnitsa and advanced into Serbian territory taking Pirot and clearing the way to Niš . When Austria-Hungary declared that it would join the war on the side of Serbia, Bulgaria withdrew from Serbia leaving the Serbo-Bulgarian border precisely where it had been prior to the war. The peace treaty was signed on February 19, 1886, in Bucharest . As a result of

6968-418: The east, south, and west. In the first decades of the principality, the population was about 85% Serb and 15% non-Serb. Of those, most were Vlachs, and there were some Turkicized Muslim Albanians, which were the overwhelming majority of the Muslims that lived in Smederevo , Kladovo and Ćuprija . The new state aimed to homogenize its population, especially after two Great Migrations of the Serbs also known as

7072-421: The end of World War I in 1918 it united with Vojvodina and the Kingdom of Montenegro , and in December 1918 it merged with the newly created State of Slovenes, Croats and Serbs to form the Kingdom of Serbs, Croats and Slovenes (later known as Kingdom of Yugoslavia ) under the continued rule of the Karađorđević dynasty . The Principality of Serbia was a state in the Balkans that came into existence as

7176-448: The entire Kriegsmarine, replacing Erich Raeder . He retained the title, but was replaced as operational commander at BdU by his chief of staff Eberhard Godt . Godt's successor was Admiral Hans Georg von Friedeburg , who held the position at the end of the war and became commander-in-chief of the German navy when Dönitz became head of Nazi Germany after Hitler's suicide. Dobratz had transferred from navy to Luftwaffe in 1935. He rejoined

7280-420: The expansion of the French colonial empire . In 1873, Bismarck negotiated the League of the Three Emperors , which included Austria-Hungary , Russia and Germany. After the 1877–1878 Russo-Turkish War , the League was dissolved due to Austrian concerns over the expansion of Russian influence in the Balkans , an area they considered to be of vital strategic interest. Germany and Austria-Hungary then formed

7384-400: The first time on the Western Front. Several types of gas soon became widely used by both sides and though it never proved a decisive, battle-winning weapon, it became one of the most feared and best-remembered horrors of the war. In February 1916, the Germans attacked French defensive positions at the Battle of Verdun , lasting until December 1916. Casualties were greater for the French, but

7488-595: The front. Serbian and French troops finally made a breakthrough in September 1918 in the Vardar offensive , after most German and Austro-Hungarian troops had been withdrawn. The Bulgarians were defeated at the Battle of Dobro Pole , and by 25 September British and French troops had crossed the border into Bulgaria proper as the Bulgarian army collapsed. Bulgaria capitulated four days later, on 29 September 1918. The German high command responded by despatching troops to hold

7592-542: The globe, some of which were subsequently used to attack Allied merchant shipping . These were systematically hunted down by the Royal Navy, though not before causing considerable damage. One of the most successful was the SMS ; Emden , part of the German East Asia Squadron stationed at Qingdao , which seized or sank 15 merchantmen, a Russian cruiser and a French destroyer. Most of the squadron

7696-549: The high ground, while their trenches tended to be better built; those constructed by the French and English were initially considered "temporary", only needed until an offensive would destroy the German defences. Both sides tried to break the stalemate using scientific and technological advances. On 22 April 1915, at the Second Battle of Ypres , the Germans (violating the Hague Convention ) used chlorine gas for

7800-470: The investigation and trial of Serbians linked to the assassination. Claiming this amounted to rejection, Austria broke off diplomatic relations and ordered partial mobilisation the next day; on 28 July, they declared war on Serbia and began shelling Belgrade . Russia ordered general mobilization in support of Serbia on 30 July. Anxious to ensure backing from the SPD political opposition by presenting Russia as

7904-408: The line, but these forces were too weak to re-establish a front. Kingdom of Serbia In 1882, Serbia was elevated to the status of a kingdom, maintaining a foreign policy friendly to Austria-Hungary . Between 1912 and 1913, Serbia greatly enlarged its territory through engagement in the First and Second Balkan Wars – Sandžak-Raška , Kosovo Vilayet and Vardar Macedonia were annexed. At

8008-839: The long-standing balance of power in Europe, as well as economic competition between nations triggered by industrialisation and imperialism . Growing tensions between the great powers and in the Balkans reached a breaking point on 28 June 1914, when a Bosnian Serb named Gavrilo Princip assassinated Archduke Franz Ferdinand , heir to the Austro-Hungarian throne. Austria-Hungary held Serbia responsible, and declared war on 28 July. After Russia mobilised in Serbia's defence, Germany declared war on Russia and France , who had an alliance . The United Kingdom entered after Germany invaded Belgium , whose neutrality it guaranteed, and

8112-675: The new dynasty relied on the support of the Russian Empire and closer cooperation with Kingdom of Bulgaria . In April 1904 the Friendship treaty and in June 1905 the customs union with Bulgaria were signed. In response Austria-Hungary imposed a Tariff War ( Pig war ) of 1906–1909. After the 1906 elections the People's Radical Party came to power. In 1908 Austria-Hungary annexed Bosnia, where Serbia had hoped to expand its territory. The Bosnian Crisis of 1908–1909 (also referred to as

8216-537: The newly liberated areas: Bitola , Debar , Kavadarci , Novi Pazar , Kumanovo , Pljevlja , Prizren , Priština , Skopje , Tetovo and Štip . During its existence, the Kingdom was ruled by two competing dynasties: the House of Obrenović and the House of Karađorđević . King Milan Obrenović ruled from 6 March 1882 to 6 March 1889, when he abdicated the throne. He was succeeded by his son, Aleksandar Obrenović , who ruled from 6 March 1889 to 11 June 1903, when he

8320-565: The obligation to sign commercial contracts was imposed on Serbia, as well as a claim to carry out regulation works in Đerdap . Serbian Government approved this treaty by adopting the Law on Proclamation of the convention. Consequently, Serbian Railways were formed in 1881. The regular traffic on the railway line Belgrade–Niš started in 1884. The Kingdom of Serbia participated in the International Exhibition of Art of 1911 , with

8424-465: The ocean, even to neutral ships. Since there was limited response to this tactic, Germany expected a similar response to its unrestricted submarine warfare. The Battle of Jutland in May/June 1916 was the only full-scale clash of battleships during the war, and one of the largest in history. The clash was indecisive, though the Germans inflicted more damage than they received; thereafter the bulk of

8528-801: The protection of the " cruiser rules ", which demanded warning and movement of crews to "a place of safety" (a standard that lifeboats did not meet). Finally, in early 1917, Germany adopted a policy of unrestricted submarine warfare , realising the Americans would eventually enter the war. Germany sought to strangle Allied sea lanes before the United States could transport a large army overseas, but, after initial successes, eventually failed to do so. The U-boat threat lessened in 1917, when merchant ships began travelling in convoys , escorted by destroyers . This tactic made it difficult for U-boats to find targets, which significantly lessened losses; after

8632-550: The reasons why King Milan I abdicated in 1889. His son Alexander I assumed the throne in 1893 and in 1894 dismissed the constitution. Jews from modern-day North Macedonia got their citizen rights after the region became a part of Kingdom of Serbia. King Alexander I of Serbia and his unpopular wife Queen Draga were assassinated inside the Royal Palace in Belgrade on the night of 28–29 May 1903. Other representatives of

8736-484: The tensions between Austria-Hungary and Serbia to a head. Behind the assassination in Sarajevo was the secret Serbian officers organization Black Hand . The assassins were supported by an "underground railroad" of Serbian civilians and military officers that provided transportation and hid them; members of the Serbian military that trained them, encouraged them, and provided weapons, maps, and other information. After

8840-469: The term First World War was in September 1914 by German biologist and philosopher Ernst Haeckel who stated, "There is no doubt that the course and character of the feared 'European War' ... will become the first world war in the full sense of the word." For much of the 19th century, the major European powers maintained a tenuous balance of power , known as the Concert of Europe . After 1848, this

8944-482: The territory of Macedonia among the members of the Balkan League and primarily Serbia and Bulgaria, led to the Second Balkan War . Here, Serbia, Greece, Romania, the Ottoman Empire, and Montenegro fought against Bulgaria in 1913. The final borders were ratified at the Treaty of Bucharest of 1913 . Serbia came to control the land which became known as Vardar Macedonia , and today stands independent as

9048-691: The threat posed by the closing of this gap was more important than competing with the Royal Navy. After Germany expanded its standing army by 170,000 troops in 1913, France extended compulsory military service from two to three years; similar measures were taken by the Balkan powers and Italy, which led to increased expenditure by the Ottomans and Austria-Hungary. Absolute figures are difficult to calculate due to differences in categorising expenditure since they often omit civilian infrastructure projects like railways which had logistical importance and military use. It

9152-593: The war ended with the Armistice of 11 November 1918 . The Paris Peace Conference of 1919–1920 imposed settlements on the defeated powers, most notably the Treaty of Versailles , by which Germany lost significant territories, was disarmed, and was required to pay large war reparations to the Allies. The dissolution of the Russian, German, Austro-Hungarian, and Ottoman Empires redrew national boundaries and resulted in

9256-601: The war involved British, French, and German colonial forces in Africa. On 6–7 August, French and British troops invaded the German protectorates of Togoland and Kamerun . On 10 August, German forces in South-West Africa attacked South Africa; sporadic and fierce fighting continued for the rest of the war. The German colonial forces in German East Africa , led by Colonel Paul von Lettow-Vorbeck , fought

9360-498: The war started, Serbia, together with Montenegro, conquered Pristina and Novi Pazar . At the Battle of Kumanovo Serbs defeated the Ottoman army and proceeded to conquer Skopje and the whole of Kosovo vilayet . The region of Metohija was taken by Montenegro. At Bitola and Ohrid Serbian army units established contact with the Greek army. Populations of ethnic Serbs and Albanians tended to shift following territorial conquests. As

9464-538: The war, European powers acknowledged the act of Unification of Bulgaria which happened on September 6, 1885. Negotiations between Russia, Serbia and Bulgaria led to the Serbian-Bulgarian Treaty of Alliance of March 1912, which aimed to conquer and to divide the Ottoman held Macedonia. In May, a Serbian-Greek alliance was reached and in October 1912, a Serbia-Montenegro alliance was signed. After

9568-477: The west , which despite initial successes left the German Army exhausted and demoralised. A successful Allied counter-offensive from August 1918 caused a collapse of the German front line. By early November, Bulgaria, the Ottoman Empire and Austria-Hungary had each signed armistices with the Allies, leaving Germany isolated. Facing a revolution at home , Kaiser Wilhelm   II abdicated on 9 November, and

9672-552: Was Kapitan zur See/Kommodore Andreas Michelsen , previously head of the High Seas Fleet ’s destroyer force. The post was abolished with the end of the war. It was revived on 17 October 1939, when Karl Dönitz was promoted to rear admiral ( Konteradmiral ). His previous title had been FdU, a position he had held from January 1936. On 31 January 1943 Dönitz was promoted to grand admiral ( Großadmiral ) and became supreme commander ( Oberbefehlshaber der Kriegsmarine ) of

9776-696: Was a global conflict between two coalitions: the Allies (or Entente) and the Central Powers . Fighting took place mainly in Europe and the Middle East , as well as in parts of Africa and the Asia-Pacific , and in Europe was characterised by trench warfare ; the widespread use of artillery , machine guns, and chemical weapons (gas); and the introductions of tanks and aircraft . World War I

9880-437: Was by the coup d'état . However, he finally did accept and was the Kingdom's sovereign from 15 June 1903 to 1 December 1918, the day that the Kingdom of Serbs, Croats and Slovenes was proclaimed. The largest cities in the Kingdom of Serbia were (with population figures from c. 1910–1912): Serbia was geographically located in the path of several trade routes linking Western and Central Europe with Middle East. Morava Valley

9984-403: Was challenged by Britain's withdrawal into so-called splendid isolation , the decline of the Ottoman Empire , New Imperialism , and the rise of Prussia under Otto von Bismarck . Victory in the 1870–1871 Franco-Prussian War allowed Bismarck to consolidate a German Empire . Post-1871, the primary aim of French policy was to avenge this defeat, but by the early 1890s, this had switched to

10088-500: Was in the strategically important terrestrial route that linked Central Europe with Greece and Constantinople. During the 19th century major efforts were made to improve the transport in this connections. At the Congress of Berlin in 1878, Austria-Hungary helped Serbia to gain new territories, conditioning Serbia, however, to sign a new convention. The convention obliged Serbia to construct the railway line from Belgrade to Vranje and Turkish and Bulgarian borders in three years. In addition,

10192-511: Was killed by a group of officers. The slaughter of the royal couple (the king and Queen Draga ) by the Black Hand shocked Europe. This opened the way for the descendants of Karađorđe (Karageorge), regarded by Serbs throughout the Balkans as the man who threw off the Turkish yoke, to return to the throne. Petar Karađorđević was initially reluctant to accept the crown, disgusted as he

10296-467: Was occupied by foreign troops after a combined invasion by Austro-Hungarian , German , and Bulgarian troops. The 135,000 soldiers of the Serbian Army retreated through Albania and were evacuated to the Greek island of Corfu , and in spring, 1916, they became part of a newly formed Salonika front . In 1916, the Kingdom of Montenegro was conquered by Austria-Hungary. At the end of the war and

10400-415: Was one of the deadliest conflicts in history , resulting in an estimated 10 million military dead and more than 20 million wounded , plus some 10 million civilian dead from causes including genocide . The movement of large numbers of people was a major factor in the deadly Spanish flu pandemic. The causes of World War I included the rise of Germany and decline of the Ottoman Empire , which disturbed

10504-654: Was refused. Early on the morning of 4   August, the Germans invaded, and Albert I of Belgium called for assistance under the Treaty of London . Britain sent Germany an ultimatum demanding they withdraw from Belgium; when this expired at midnight, without a response, the two empires were at war. Germany promised to support Austria-Hungary's invasion of Serbia, but interpretations of what this meant differed. Previously tested deployment plans had been replaced early in 1914, but those had never been tested in exercises. Austro-Hungarian leaders believed Germany would cover its northern flank against Russia. Beginning on 12 August,

10608-667: Was returning to Germany when it sank two British armoured cruisers at the Battle of Coronel in November 1914, before being virtually destroyed at the Battle of the Falkland Islands in December. The SMS Dresden escaped with a few auxiliaries, but after the Battle of Más a Tierra , these too were either destroyed or interned. Soon after the outbreak of hostilities, Britain began a naval blockade of Germany . This proved effective in cutting off vital supplies, though it violated accepted international law. Britain also mined international waters which closed off entire sections of

10712-471: Was severely opposed by the Serbian public and intelligentsia , mainly gathered around Serbian Literary Herald ( Srpski književni glasnik ). Russia , the Ottoman Empire , Britain, the Kingdom of Italy , Serbia, the Principality of Montenegro , German Empire and France took an interest in these events. In April 1909, the 1878 Treaty of Berlin was amended to accept the new status quo and bringing

10816-781: Was the foundation of German foreign policy but in 1890, he was forced to retire by Wilhelm II . The latter was persuaded not to renew the Reinsurance Treaty by his new Chancellor , Leo von Caprivi . This gave France an opening to agree the Franco-Russian Alliance in 1894, which was then followed by the 1904 Entente Cordiale with Britain. The Triple Entente was completed by the 1907 Anglo-Russian Convention . While not formal alliances, by settling long-standing colonial disputes in Asia and Africa, British support for France or Russia in any future conflict became

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