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Sentinel Tank
The AC1 Sentinel was a cruiser tank designed in Australia in World War II in response to the war in Europe, and to the threat of Japan expanding the war to the Pacific or even a feared Japanese invasion of Australia. It was the first tank to be built with a hull cast as a single piece, and the only tank to be produced in quantity in Australia. The few Sentinels that were built never saw action as Australia's armoured divisions had been equipped by that time with British and American tanks. History When design work began in November 1940, the AC1 was originally intended to be a 2 pounder gun-equipped vehicle, a true Cruiser tank, with a weight of between 16 and 20 tonnes. Due to a lack of home grown experience in tank design, a mission was sent to the US to examine the M3 design and Colonel W.D. Watson MC, an artillery officer with many years of tank design experience was provided by the UK. He arrived in December 1940. Like the Canadian Ram, the Australian Cruiser was to be ba ...
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Sentinel (AWM 101156)
Sentinel may refer to: Places Mountains * Mount Sentinel, a mountain next to the University of Montana in Missoula, Montana * Sentinel Buttress, a volcanic crag on James Ross Island, Antarctica * Sentinel Dome, a naturally occurring granite dome in Yosemite National Park, California * Sentinel Mountain (Montana), in Glacier National Park * Sentinel Peak (Alberta) * Sentinel Peak (Antarctica) Kukri Hills () is a prominent east-west trending range, about long and over high, forming the divide between Ferrar Glacier on the south and Taylor Glacier and Taylor Valley on the north, in Victoria Land, Antarctica. The hills were discovered ... * Sentinel Peak (Arizona), a peak in the Tucson Mountains * Sentinel Peak (British Columbia) * Sentinel Range, a mountain range in Antarctica * The Sentinel, Hout Bay * The Sentinel (Zion), a sandstone summit in Zion National Park, Utah Elsewhere * Sentinel, Arizona * Sentinel, California * Sentinel, Missouri * Sentinel, Oklahoma * S ...
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Petrol
Gasoline (; ) or petrol (; ) (see ) is a transparent, petroleum-derived flammable liquid that is used primarily as a fuel in most spark-ignited internal combustion engines (also known as petrol engines). It consists mostly of organic compounds obtained by the fractional distillation of petroleum, enhanced with a variety of additives. On average, U.S. refineries produce, from a barrel of crude oil, about 19 to 20 gallons of gasoline; 11 to 13 gallons of distillate fuel (most of which is sold as diesel fuel); and 3 to 4 gallons of jet fuel. The product ratio depends on the processing in an oil refinery and the crude oil assay. A barrel of oil is defined as holding 42 US gallons, which is about 159 liters or 35 imperial gallons. The characteristic of a particular gasoline blend to resist igniting too early (which causes knocking and reduces efficiency in reciprocating engines) is measured by its octane rating, which is produced in several grades. Tetraethyl lead and other ...
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Ordnance QF 17 Pounder
The Ordnance Quick-Firing 17-pounder (or just 17-pdr)Under the British standard ordnance weights and measurements the gun's approximate projectile weight is used to denote different guns of the same calibre. Hence this was a 3-inch gun, of which there were several types in British service, which fired a projectile weighing approximately was a 76.2 mm (3 inch) gun developed by the United Kingdom during World War II. It was used as an anti-tank gun on its own carriage, as well as equipping a number of British tanks. Used with the APDS shot, it was capable of defeating all but the thickest armour on German tanks. It was used to 'up-gun' some foreign-built vehicles in British service, notably to produce the Sherman Firefly variant of the US M4 Sherman tank, giving British tank units the ability to hold their own against their German counterparts. In the anti-tank role, it was replaced after the war by the 120 mm BAT recoilless rifle. As a tank gun, it was succeeded by the ...
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Allies Of World War II
The Allies, formally referred to as the United Nations from 1942, were an international military coalition formed during the Second World War (1939–1945) to oppose the Axis powers, led by Nazi Germany, Imperial Japan, and Fascist Italy. Its principal members by 1941 were the United Kingdom, United States, Soviet Union, and China. Membership in the Allies varied during the course of the war. When the conflict broke out on 1 September 1939, the Allied coalition consisted of the United Kingdom, France, and Poland, as well as their respective dependencies, such as British India. They were soon joined by the independent dominions of the British Commonwealth: Canada, Australia, New Zealand and South Africa. Consequently, the initial alliance resembled that of the First World War. As Axis forces began invading northern Europe and the Balkans, the Allies added the Netherlands, Belgium, Norway, Greece, and Yugoslavia. The Soviet Union, which initially had a nonaggression pa ...
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Sentinel Tank Final Assembly
Sentinel may refer to: Places Mountains * Mount Sentinel, a mountain next to the University of Montana in Missoula, Montana * Sentinel Buttress, a volcanic crag on James Ross Island, Antarctica * Sentinel Dome, a naturally occurring granite dome in Yosemite National Park, California * Sentinel Mountain (Montana), in Glacier National Park * Sentinel Peak (Alberta) * Sentinel Peak (Antarctica) * Sentinel Peak (Arizona), a peak in the Tucson Mountains * Sentinel Peak (British Columbia) * Sentinel Range, a mountain range in Antarctica * The Sentinel, Hout Bay * The Sentinel (Zion), a sandstone summit in Zion National Park, Utah Elsewhere * Sentinel, Arizona * Sentinel, California * Sentinel, Missouri * Sentinel, Oklahoma * Sentinel Island (other) Arts, entertainment, and media Artworks * ''Sentinel'' (sculpture), a 2000 sculpture by Tim Tolkien * ''Sentinels'' (Hudson), a 2005 public artwork by American artist Jon Barlow Hudson Comics * ''Sentinel'' (comic b ...
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Ordnance QF 25-pounder Short
The Ordnance QF 25-pounder Short was an Australian variant of the British Ordnance QF 25-pounder field gun/howitzer. The gun was developed by modifying the 25-pounder's design to improve its mobility during jungle warfare. Development began in 1942, and the weapon first entered service with the Australian Army the next year. It was used by several Royal Australian Artillery regiments during fighting in the South West Pacific Area, before being declared obsolete in 1946. The development of the Ordnance QF 25-pounder Short was an important achievement for Australia's defence industry, and provided the Army with a weapon suited to conditions in the South West Pacific. Nevertheless, the gun's performance was inferior to that of the standard 25-pounder, and it received a mixed reception from artillerymen. Background The Australian Army began to be equipped with British-built 25-pounder guns in 1940. The gun proved successful, and was the standard equipment of Australian field batteries ...
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Howitzer
A howitzer () is a long- ranged weapon, falling between a cannon (also known as an artillery gun in the United States), which fires shells at flat trajectories, and a mortar, which fires at high angles of ascent and descent. Howitzers, like other artillery equipment, are usually organized in a group called a battery. Howitzers, together with long-barreled guns, mortars, and rocket artillery, are the four basic types of modern artillery. Mortars fire at angles of elevation greater than 45°, and are useful for mountain warfare because the projectile could go over obstacles. Cannons fire at low angles of elevation (<45°), and the projectile lands much faster at its target than it would in the case of a mortar. But the cannon is not useful if there is an obstacle like a hill/wall in front of its target.


Etymology

The English word ''howitzer'' comes from the Czech word , from , 'crowd', and is in turn a borrowing from the Middle High German word or (mode ...
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QF 25 Pounder
The Ordnance QF 25-pounder, or more simply 25-pounder or 25-pdr, was the major British field gun and howitzer during the World War II, Second World War. Its calibre is 3.45-inch (87.6 mm). It was introduced into service just before the war started, combining both high-angle and direct-fire abilities, a relatively high rate of fire, and a reasonably lethal shell in a highly mobile piece. It remained the British Army's primary artillery field piece well into the 1960s, with smaller numbers serving in training units until the 1980s. Many Commonwealth of Nations countries used theirs in active or reserve service until about the 1970s and ammunition for the weapon is currently being produced by Pakistan Ordnance Factories. Initial production was slow, but by 1945, over 12,000 had been manufactured. The 25-pounder was probably the most outstanding field artillery piece used by British and Commonwealth forces in the Second World War, being durable, easy to operate and versatile. Des ...
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Thunderbolt Tank
AC3 Thunderbolt (Australian Cruiser III) was a cruiser tank designed and built in Australia in World War II as the successor to the AC1 Sentinel. Like the Sentinel the AC3 featured a one piece cast hull and turret. The AC3 featured a much improved design over the AC1 with better armour protection, a more powerful engine, and most importantly increased firepower. The program was terminated in 1943 before any production vehicles were completed. History Even before the AC1 Sentinel began rolling off the assembly line in August 1942 it had been seen that the 2 pounder was becoming less effective as tank armour increased in thickness on new and improved enemy tanks. To address this a 25 pounder (87.6 mm, 3.45 in) gun- howitzer was fitted to a turret on the second prototype Australian cruiser tank hull and successfully test fired on 29 June 1942. With this success decided to use the 25 pounder as a tank gun. The 25 pounder, redesigned as a tank gun, was tested on 10 October 1942 ...
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The Rats Of Tobruk (film)
''The Rats of Tobruk'' is a 1944 Australian film directed by Charles Chauvel. An abridged version was released in the United States in 1951 as ''The Fighting Rats of Tobruk''. The film follows three drover friends who enlist in the Australian Army together during World War II. Their story is based on the siege of the Libyan city of Tobruk in North Africa by Rommel's Afrika Korps. The largely Australian defenders held the city for 250 days before being relieved by British forces. Plot Three friends are droving cattle in Australia in 1939: the restless Bluey Donkin, easy-going Milo Trent and English Peter Linton, who is in the country on a working holiday. Squatter's daughter Kate Carmody is in love with Bluey but he refuses to be tied down to any one woman. War breaks out and the three men enlist in the Australian army and are assigned to the 9th Division. They ship out to Africa. After early successes against the Italian army, the army is besieged in Tobruk. In between attacks ...
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Australian 3rd Army Tank Brigade
The 3rd Army Tank Brigade was an armoured brigade of the Australian Army during the Second World War. The brigade was formed in May 1942 and disbanded in September 1943 without seeing combat. History The 3rd Army Tank Brigade was formed on 6 May 1942 to provide armoured support to infantry formations. The brigade headquarters was formed from the previously existing 4th Motor Brigade, although its constituent motor regiments (6th, 7th and 14th) were either disbanded or transferred to the 2nd Motor Brigade. It comprised three regiments which had previously formed part of the 1st Cavalry Division; the 1st Machine Gun Regiment, 2nd Armoured Regiment and 3rd Armoured Regiment. For consistency with similar British units, these regiments were renamed the 1st, 2nd and 3rd Army Tank Battalions respectively. The brigade was equipped with Matilda II infantry tanks which had previously been issued to the 1st Armoured Brigade. The 3rd Army Tank Brigade was also placed under the overall ...
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