<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 a larger force than the British army. The Germans also had a better strategy. The British had to send many troops to the Somme, but the Germans could send more troops to the Somme. This meant that the Germans had more troops to fight with, which made it harder for the British to win.