The tank was originally developed by the British Army in 1914 to help spearhead offensives. These vehicles were not instrumental in helping the Allies win the key battles which eventually led to the end of the war in 1918.
The idea of armored vehicles being used in combat were originally developed by Royal Navy. The British produced about 2600 tanks during the entire war and deployed them in a multitude of engagements.
The first of these was the Battle of Flers-Courcelette during the Somme offensive. The tanks were not successful in meeting their objectives due to lack of training on the part of their crews, but as the war drug on the British refined their tactics and were able to boost the effectiveness of the tank in battle.
The tank went on to see growing but still limited success in other campaigns. At the Battle of Cambrai 180 were put out of action in less then one day of fighting. The failed tank-ked offensive resulted in a German counter-attack that nearly cost the British the entire battle.
Although the tank’s successes were few in World War I, both sides saw the potential for the weapon and redesigned the tank during the interwar years. In World War II it is arguable that the tank decided the outcome on the eastern front, and therefore the war in Europe.