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Canal Defence Light

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The Canal Defence Light (CDL) was a British "secret weapon" of the Second World War , based upon the use of a powerful carbon-arc searchlight mounted on a tank. It was intended to be used during night-time attacks, when the light would allow enemy positions to be targeted. A secondary use of the light would be to dazzle and disorient enemy troops, making it harder for them to return fire accurately. The name Canal Defence Light was used to conceal the device's true purpose. For the same reason, in US service they were designated T10 Shop Tractor .

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56-546: The idea is credited to a Greek citizen, Marcel Mitzakis, who devised the system for the de Thoren Syndicate in the 1930s; they were advised by J F C Fuller . The device was demonstrated to the British War Office in 1937. Although three examples were ordered for tests, the trials did not begin until 1940, when the War Office took over and ordered 300 lights for fitting to tanks. A prototype was constructed using

112-435: A Matilda II tank. The tank's normal turret was replaced with a cylindrical one containing both a 13 million candlepower (12.8 million candela ) searchlight and a machine gun. The searchlight turret included a station for an operator, who had the task of changing the light's carbon electrodes when they burned out. The light emerged from a vertical slit that was just 2 inches (5.1 cm) wide by 24 inches (61 cm) tall,

168-555: A boy, he returned to England at the age of 11 without them; three years later, at "the somewhat advanced age of 14", he began attending Malvern College and, later trained for an army career at the Royal Military College, Sandhurst , from 1897 to 1898. His nickname of "Boney", which he was to retain, is said to have come either from an admiration for Napoleon Bonaparte , or from an imperious manner combined with military brilliance which resembled Napoleon's. Fuller

224-579: A conspiracy against the British government in 1940. Fuller was born in Chichester , West Sussex , the son of Alfred Fuller (1832-1927), an Anglican clergyman, and Selma Marie Philippine (1847-1940), née de la Chevallerie. of French descent but raised in Germany. Alfred Fuller retired as rector of Itchenor and moved to Chichester, where his son was born. After moving to Lausanne with his parents as

280-671: A hindrance to his career. Crowley writes in chapter 67 of his book, The Confessions of Aleister Crowley : ...to my breathless amazement he fired pointblank at my head a document in which he agreed to continue his co-operation on condition that I refrain from mentioning his name in public or private under penalty of paying him a hundred pounds for each such offence. I sat down and poured in a broadside at close quarters. "My dear man," I said in effect, "do recover your sense of proportion, to say nothing of your sense of humour. Your contribution, indeed! I can do in two days what takes you six months, and my real reason for ever printing your work at all

336-403: A knack for aphorisms , witness: "To attack the nerves of an army, and through its nerves the will of its commander, is more profitable than battering to pieces the bodies of its men." His Lectures have attracted much attention over the course of decades, with one staff writer even going so far as to extend his vision of the tank as "master-weapon" to say that the helicopter not the tank would be

392-500: A man famous in arms and letters, one who has known the greatest statesmen, warriors, dictators, of our age, declare solemnly that the most extraordinary genius he ever knew was Crowley." After the Second World War and Crowley's death, Fuller wrote a letter to Edward Noel FitzGerald stating: "Crowley was a genuine avatar, but I don't think he knew it, but I do think he senses it in an emotional way." (17 September 1949) Fuller

448-512: A master, but please don't think that either I or the Work depend on you, any more than J.P. Morgan depends on his favourite clerk." After this, contact between the two men faded rapidly. The front pages of the 1913 issues of the Equinox (Volume 1, nos. 9 and 10), which gave general directions to A∴A∴ members, included a notice on the subject of Fuller, who was described as a "former Probationer";

504-439: A normal M3 tank. The operator was the only occupant of the turret—the vehicle commander had a seat to the left of the driver. The project was shrouded in secrecy. It was tested during Exercise Primrose in 1943 at Tighnabruaich , Scotland; it was concluded that it was "too uncertain to be depended upon as the main feature of an invasion". The CDL was shown to senior US officers (including generals Eisenhower and Clark) in 1942 and

560-492: A potential leader of the coup, with Fuller telling retired Admiral Barry Domvile , a fellow Nazi sympathizer, that "Ironside is with us." A fellow conspirator, Samuel Darwin-Fox, told an MI5 agent that: "Italy would declare war almost immediately, that France would then give in and that Britain would follow before the end of the week. There would be a short civil war, the Government would leave first for Bristol and then for

616-634: A regular infantry brigade and the garrison of Tidworth Camp on Salisbury Plain . Fuller believed he would be unable to devote himself to the Experimental Mechanized Force and the development of mechanized warfare techniques without extra staff to assist him with the additional extraneous duties, which the War Office refused to allocate. He was promoted to major-general in 1930 and retired three years later to devote himself entirely to writing. After retirement, Fuller served as

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672-606: A reporter during the Italian invasion of Ethiopia (1935) and the Spanish Civil War (1936–1939). Impatient with what he considered the inability of democracy to adopt military reforms, Fuller became involved with Sir Oswald Mosley and the British fascist movement. As a member of the British Union of Fascists (BUF), he sat on the party's Policy Directorate and was considered one of Mosley's closest allies. He

728-462: A small size which reduced the chance of battle damage to the optical system. The beam diverged at 19° horizontally and 1.9° vertically, forming a pool of light of around 34 by 340 yards (31 m × 311 m) at a distance of 1,000 yards (910 m). The turret could rotate 360° and the light beam could be elevated or lowered by 10° from the horizontal. Blue and amber filters allowed the light to be coloured as well as white. A shutter could flash

784-493: Is displayed at Cavalry Tank Museum , Ahmednagar in India. J F C Fuller Major-General John Frederick Charles " Boney " Fuller CB CBE DSO (1 September 1878 – 10 February 1966) was a senior British Army officer , military historian , and strategist , known as an early theorist of modern armoured warfare , including categorising principles of warfare . With 45 books and many articles, he

840-410: Is my friendship for you. I wanted to give you a leg up the literary ladder. I have taken endless pain to teach you the first principles of writing. When I met you, you were not so much as a fifth-rate journalist, and now you can write quite good prose with no more than my blue pencil through two out of every three adjectives, and five out of every six commas. Another three years with me and I will make you

896-779: The First Oxfordshire Light Infantry he had entered and won a contest to write the best review of Crowley's poetic works, after which it turned out that he was the only entrant. This essay was later published in book form in 1907 as The Star in the West . After this he became an enthusiastic supporter of Crowley, joining his magical order, the A∴A∴ ., within which he became a leading member, editing order documents and its journal, The Equinox . During this period he wrote The Treasure House of Images , edited early sections of Crowley's magical autobiography The Temple of Solomon

952-678: The Red Army , which developed its armored warfare doctrine based on deep operations , which were developed by Soviet military theorists Marshal M. N. Tukhachevsky et al. in the 1920s based on their experiences in the First World War and the Russian Civil War . Fuller was the only foreigner present at Nazi Germany's first armed manoeuvres in 1935. Fuller frequently praised Adolf Hitler in his speeches and articles, once describing him as "that realistic idealist who has awakened

1008-644: The Second World War , 1939–1945, Fuller was under suspicion for his Nazi sympathies. At one meeting of the Right Club , which had been set up in May 1939, Fuller, declared the need for "a bloody revolution" in Britain and added "I am ready to start one right away." In 1940, Fuller was implicated as a participant in a fascist plot, organized by Leigh Vaughan-Henry, against the British government. Vaughan-Henry

1064-541: The " Law of Threes " throughout his work. Fuller did not believe the Principles stood alone as is thought today, but that they complemented and overlapped each other as part of a whole, forming the Law of Economy of Force . These Principles were further grouped into the categories of Control (command / co-operation), Pressure (attack / activity) and Resistance (protection / stability). The Principles of Control guides

1120-603: The 357th Searchlight Battery, Royal Artillery provided hazy indirect light for the mine-clearing flail tanks supporting the infantry in Operation Clipper . Some British tanks were sent to India in 1945. The US Tenth Army requested deployment of CDL tanks for use during the Battle of Okinawa , but fighting there was complete by the time they arrived. During the Korean War, there was a requirement for searchlights on

1176-505: The Autumn offensives of 1918. His Plan 1919 for a fully mechanised offensive against the German army was never implemented. After 1918 he held various leading positions, notably as a commander of an experimental brigade at Aldershot . After the war Fuller collaborated with his colleague B. H. Liddell Hart in developing new ideas for the mechanisation of armies, launching a crusade for

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1232-468: The British as part of the 79th Armoured Division . The British 35th Tank Brigade and US 9th Armored Group were retained in the UK. The system was highly secret as surprise was considered essential to its use. This hampered its employment, as commanders were often unfamiliar with, or did not know of it, and did not consider it when drawing up plans for attack. Rather than let trained tank crews sit idle, most of

1288-517: The CDLs to protect the Ludendorff Bridge after it was captured intact during the Battle of Remagen . The Germans used virtually every weapon at their disposal to try to destroy the bridge. This included sending frogmen, using Italian underwater breathing apparatus, to plant floating mines but they were discovered by US Army military police , who used Canal Defence Lights to locate and blind

1344-700: The Colonies, General Ironside would become dictator and after things had settled down Germany could do as she liked with Britain." Fuller spent his last years believing that the wrong side had won the Second World War. He most fully announced that thesis in the 1961 edition of The Reformation of War . There, he announced his belief that Hitler was the saviour of the West against the Soviet Union and denounced Churchill and Roosevelt for being too stupid to see so. Fuller died in Falmouth , Cornwall, in 1966. Fuller

1400-703: The Corps of Engineers. The final assembly of the CDL tank was at Rock Island Arsenal . By the end of 1944, Alco had produced 497 tanks. American crews were trained at Fort Knox and in the California-Arizona manoeuvre area. The six battalions of tanks then moved to the UK to join the British CDL tanks in Wales. The British and American CDL units deployed to the continent did not cross over to France until August,

1456-543: The King and produced highly regarded paintings dealing with A∴A∴ teachings: these paintings have been used in recent years as the covers of the journal's revival, The Equinox, Volume IV . After the April 1911 Jones vs. The Looking Glass case, in which a great deal was made of Aleister Crowley's bisexuality (although Crowley himself was not a party to the case), Fuller became worried that his association with Crowley might be

1512-748: The Middle East without seeing action, returning to the UK in April 1944. It landed in Normandy on 12 August 1944, seeing no action until 29 September 1944, when it was ordered to transfer all of its equipment to the 42nd and 49th Royal Tank Regiments, and was retrained to operate the American amphibious LVT-4 , known by the British Army as the Buffalo Mark IV. In their turn, the 42nd and 49th Royal Tank Regiments were largely inactive for

1568-517: The US M3 Grant , which was superior in several ways. It was a larger, roomier and better-armoured tank, also faster and better able to keep up with tanks such as the Sherman. It was armed with a 75 mm gun mounted in the hull and a 37 mm gun in a turret, so could retain some fighting capacity when the searchlight turret was mounted. A dummy gun-barrel fitted to the turret made it resemble

1624-602: The US decided to produce their own tanks using the CDL design. The codenames "Leaflet" for the tank, and "Cassock" for the training programme for crews were used. For secrecy the construction was dispersed. Conversion of the M3 to take the CDL was by the American Locomotive Company as "Shop Tractor M10", turrets were produced by Pressed Steel Car Company as "coast defence turrets", and the arc lamps were sourced through

1680-465: The advantage to shift back and forth between the offensive and the defensive. Fuller's firsthand experience in the First World War saw a shift from the defensive power of the machine gun to the offensive power of the tank. Fuller had an occultist side that oddly mixed with his military side. He was an early disciple of English poet and magician Aleister Crowley , and was very familiar with his and other forms of magick and mysticism . While serving in

1736-487: The battlefield. There was brief interest in resurrecting a CDL on an M4 Sherman design (T52) that had started in 1944, but it was recognized that four battalions could be equipped with normal searchlights for the cost of a single CDL tank. The only surviving CDL-equipped Matilda tank is in the collection of the Royal Armoured Corps at The Tank Museum , Bovington, Dorset, in Britain. One CDL-equipped M3 Grant

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1792-410: The beam on and off, up to twice a second. It was found that the blue light caused the CDL tank to appear to be at a greater distance, and blue and amber light beams from two CDL tanks could combine to illuminate a target with white. A flashing beam would further dazzle and disorient enemy troops by not giving their eyes a chance to adapt to either light or darkness. The Matilda tank was later replaced by

1848-500: The bridges for the benefit of engineers carrying out maintenance. Conventional searchlights would have been more suitable, but none were available. The CDLs were eventually replaced by captured German searchlights. The 11th Royal Tank Regiment was raised in January 1941 and designated for the CDL role in May 1941. The unit trained at Lowther Castle near Penrith , and was based at Brougham Hall , Cumberland. It spent 1942 and 1943 in

1904-474: The chief determinant of success on the battlefield from the late 20th century. The book was carefully read by General Heinz Guderian of later Blitzkrieg fame and at the time Germany's foremost tank expert. The Soviet Army initially issued 30,000 copies of it and designated it as a table book for all Red Army officers. Later, the Soviets increased publication to 100,000 volumes. In Czechoslovakia, it became

1960-496: The commander, but they are a factor in the use of Force. Force resides in the center of the pattern, as all of these elements revolve around it. These Principles of War have been adopted and further refined by the military forces of several nations, most notably within NATO, and continue to be applied widely to modern strategic thinking. Recently they have also been applied to business tactics and hobby wargaming . Fuller also had

2016-490: The common sense of the British people by setting out to create a new Germany". On 20 April 1939, Fuller was an honoured guest at Hitler's 50th birthday parade, watching as "for three hours a completely mechanised and motorised army roared past the Führer." Afterwards Hitler asked, "I hope you were pleased with your children?" Fuller replied, "Your Excellency, they have grown up so quickly that I no longer recognise them." During

2072-411: The dual Principles of Pressure and of Resistance, which in turn create the Principles of Control. They were also grouped into Cosmic ( Spiritual ), Mental ( Mind / Thought / Reason ), Moral ( Soul / Sensations / Emotions ), and Physical ( Body / Musculature / Action ) Spheres, in which two Principles (like the double-edged point of an arrowhead) combine to create or manifest a third, which in turn guides

2128-600: The first and second Principles (like the fletches on an arrow's tail). Each Sphere leads to the creation of the next until it returns to the beginning and repeats the circular cycle with reassessments of the Object and Objective to redefine the uses of Force . The Cosmic Sphere is seen as outside the other three Spheres, like the Heavens are outside the Realm of Man. They influence it indirectly in ways that cannot be controlled by

2184-443: The foundation of much of modern military theory since the 1930s, and which were originally derived from a convergence of Fuller's mystical and military interests. The Nine Principles went through several iterations; Fuller stated that "the system evolved from six principles in 1912, rose to eight in 1915, to, virtually, nineteen in 1923, and then descended to nine in 1925". For example, notice how his analysis of General Ulysses S. Grant

2240-561: The mechanisation and modernisation of the British Army. Chief instructor of Camberley Staff College from 1923, he became military assistant to the chief of the Imperial General Staff in 1926. In what came to be known as the "Tidworth Incident", Fuller turned down the command of the Experimental Mechanized Force , which was formed on 27 August 1927. The appointment also carried responsibility for

2296-690: The next year on sick-leave, where he met the woman he married in December 1906. Instead of returning to India, he was reassigned to Volunteer units in England, serving as adjutant to the 2nd South Middlesex Volunteers (amalgamated into the Kensingtons during the Haldane Reforms ) and helping to form the new 10th Middlesex . Fuller later claimed that his position with the 10th Middlesex inspired him to study soldiering seriously. In 1913, he

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2352-538: The notice disparaged Fuller's magical accomplishments and warned A∴A∴ members to accept no magical training from him. However, Fuller continued to be fascinated with occult subjects and in later years he would write about topics such as the Qabalah and yoga . During the mid-1940s, Charles Richard Cammell (author of Aleister Crowley: The Man, The Mage, The Poet ) met with Fuller and reported his views about Crowley: "I have heard an eminent personage, General J.F.C. Fuller,

2408-712: The remainder of the war and all three units were disbanded after the end of hostilities. Battalions of the American 9th Tank Group trained using the Grant variant of the CDL tank at Camp Bouse in the Arizona desert. In 1944, before deployment in the European Theatre of Operations, they continued training on the Preseli Hills in Pembrokeshire, West Wales. Before dawn, at 06:00 on 18 November 1944, CDLs of

2464-531: The special units were converted either to other special roles (such as mine clearance tanks) or regular tank units. For the crossing of the Rhine , some CDL units were used. The one British squadron that had not been converted from CDLs was used in the north, 64 American CDL tanks were brought back into use with their former crews. The US tanks were spread across the First , Third and Ninth armies. The Allies used

2520-625: The standard reference for the teaching of mechanized warfare at their staff college. Ironically, in Britain only 500 copies were sold by 1935 while in the United States, the Infantry Journal received a copy at the time of publishing but failed to review it. Fuller also developed the idea of the Constant Tactical Factor . This states that every improvement in warfare is checked by a counter-improvement, causing

2576-460: The swimmers. The armour of the CDLs made them more suitable for this task than conventional searchlights as, in some sectors, the East bank of the river was held by German forces who subjected the CDL tanks to considerable artillery and small-arms fire. The use of the system resembled its name, which had been intended to be spurious. Later, the battle moved eastwards and the CDLs were used to illuminate

2632-533: The theory that areas of large enemy activity should be bypassed to be eventually surrounded and destroyed. Blitzkrieg-style tactics were used by several nations throughout the Second World War, predominantly by the Germans in the invasion of Poland (1939), Western Europe (1940), and the Soviet Union (1941). While Germany and to some degree the Western Allies adopted Blitzkrieg ideas, they were not much used by

2688-410: Was a highly prolific author whose ideas reached army officers and the interested public. He explored the business of fighting, in terms of the relationship between warfare and social, political, and economic factors in the civilian sector. Fuller emphasised the potential of new weapons, especially tanks and aircraft, to stun a surprised enemy psychologically. Fuller, a Nazi sympathizer, was implicated in

2744-423: Was a prolific writer and published more than 45 books. Books on Warfare Biography Books on Occultism Notes Further reading For examples of the use of Fuller's campaign theories in the business world see: For examples of Fuller's occult books and pamphlets see: For examples of Fuller's fascist essays and pamphlets see: Battle of Remagen Too Many Requests If you report this error to

2800-529: Was a vigorous, expressive, and opinionated writer of military history and of controversial predictions of the future of war, publishing On Future Warfare in 1928. Seeing his teachings largely vindicated by the Second World War, he published Machine Warfare: An Enquiry into the Influence of Mechanics on the Art of War in 1942. Fuller is perhaps best known today for his "Nine Principles of War" which have formed

2856-847: Was accepted into the Staff College, Camberley , starting work there in January 1914. During the First World War , Fuller was a staff officer with the Home Forces and with VII Corps in France, and from 1916 in the Headquarters of the Machine-Gun Corps ' Heavy Branch which was later to become the Tank Corps . He helped plan the tank attack at the 20 November 1917 Battle of Cambrai and the tank operations for

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2912-756: Was also a member of the clandestine far-right group the Nordic League . Fuller's ideas on mechanised warfare continued to be influential in the lead-up to the Second World War, ironically less with his countrymen than with the Nazis , notably Heinz Guderian who spent his own money to have Fuller's Provisional Instructions for Tank and Armoured Car Training translated. In the 1930s, the German Army implemented tactics similar in many ways to Fuller's analysis, which became known as Blitzkrieg . Like Fuller, theorists of Blitzkrieg partly based their approach on

2968-635: Was commissioned into the 1st Battalion of the Oxfordshire Light Infantry (the old 43rd Foot ) on 3 August 1898. He served in the Second Boer War in South Africa from December 1899 to 1902, and was promoted to lieutenant on 24 February 1900 a couple of months after arriving there. In the spring of 1904 Fuller was sent with his unit to India, where he contracted typhoid fever in autumn of 1905; he returned to England

3024-496: Was not interned or arrested, he was the only officer of his rank not invited to return to service during the war. There was some suspicion that he was not incarcerated in May 1940 along with other leading officials of the BUF because of his association with General Edmund Ironside and other senior officers. Mosley himself admitted to "a little puzzlement" as to why Fuller had not been imprisoned. Ironside himself had been implicated as

3080-469: Was presented in 1929. The United States Army modified Fuller's list and issued its first list of the principles of war in 1921, making it the basis of advanced training for officers into the 1990s, when it finally reconceptualised its training. The Nine Principles involve the uses of force (combat power). They have been expressed in various ways, but Fuller's 1925 arrangement is as follows: Cabalistic influences on his theories can be shown by his use of

3136-597: Was reported to have already organized 18 cells of 25 members each for the coup, which was intended to take place when Germany landed in Britain. In a separate plot organized by John Beckett , Fuller was named as the Minister of Defense for a Quisling government. Fuller continued to speak out in favour of a peaceful settlement with Germany. Alan Brooke (in his war diaries, p. 201) comments that "the Director of Security called on him to discuss Boney Fuller and his Nazi activities", but Brooke commented that he did not think Fuller "had any unpatriotic intentions". Although he

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