<human>:  When did the British Army first use tanks?
<bot>: Tanks were first used in the Battle of the Somme in 1916. The British Army had to fight on two fronts in World War I, so they were forced to use tanks to help them in the Battle of the Somme. The British Army used tanks for the first time in the Battle of the Somme in 1916, but they didn’t use them to their full potential until the Battle of Cambrai in 1917.