Tanks were first used in battle during World War 1 at the Battle of the Somme in September 1916. While some tanks succeeded in supporting infantry attacks, many broke down or got stuck in the mud. Early tanks also had problems with visibility through their view slits and getting too hot inside. Technological improvements to tracks and the addition of devices to help cross trenches increased tanks' effectiveness. The largest use of tanks was at the Battle of Cambrai in 1917, where 400 British tanks surprised German forces and helped capture territory. However, tanks were still in the early experimental stages during WWI.

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