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Airplanes were just coming into military use at the outset of the war. Initially, they were used mostly for reconnaissance. Pilots and engineers learned from experience, leading to the development of many specialized types, including fighters, bombers, and trench strafers.

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Trench warfare proliferated when a revolution in firepower was not matched by similar advances in mobility, resulting in a grueling form of warfare in which the defender held the advantage. On the Western Front in 1914–1918, both sides constructed elaborate trench, underground, and dugout systems opposing each other along a front, protected from assault by barbed wire.

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The machine gun revolutionized combat efforts and quickly drove out nations with their horse-drawn carriages into submission. From its bare roots beginnings to the evolution of this iconic weapon that is still in use today, this infographic takes a look at how the machine gun came about, how it managed to almost single handedly change the outcome of WWI and subsequently change the art of war as we know it.

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"Gas warfare" refers to the widespread use of poisonous chemical gases like chlorine, phosgene, and mustard gas by both sides of the conflict, primarily on the Western Front, causing significant casualties and psychological trauma among soldiers due to their horrific effects on the respiratory system and skin.

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U-Boat Warfare and the Sinking of the Lusitania.

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U-Boat Warfare and the Sinking of the Lusitania.

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German submarines, specifically called "Unterseeboot" (U-Boat) in German, which were used to attack enemy ships, primarily merchant vessels, by the Imperial German Navy during the war; RMS Lusitania was a British-registered ocean liner that was torpedoed by an Imperial German Navy U-boat during the First World War on 7 May 1915, about 11 nautical miles (20 kilometres) off the Old Head of Kinsale, Ireland.

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U-Boat Warfare and the Sinking of the Lusitania.

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The first tanks were mechanically unreliable. There were problems that caused considerable attrition rates during combat deployment and transit. The heavily shelled terrain was impassable to conventional vehicles, and only highly mobile tanks such as the Renault FTs and Mark IV performed reasonably well.

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On April 4, 1917, the U.S. Senate voted in support of the measure to declare war on Germany. The House concurred two days later. The United States later declared war on German ally Austria-Hungary on December 7, 1917.