<human>:  Why did the British Army lose at the Battle of the Somme?
<bot>: The British Army lost because they were outnumbered. The German Army had twice as many soldiers as the British Army. The British Army also had less artillery, less machine guns, and less tanks. The Germans also had more tanks, which were more effective at destroying trenches than the British tanks were. The British also had a lot of problems with supply, and the Germans had a lot of problems with supply.