<human>:  Why did the British Army lose at the Battle of the Somme?
<bot>: The British Army lost because they were outnumbered. The Germans had more soldiers, and they had more guns. The British Army had more tanks, but they were not very good at using them. The British Army also had a bad strategy. The British planned to attack the German army with two armies. They attacked with one army and the other army was left behind to defend against the Germans. The British army was also very slow to move, so they were easily attacked by the Germans. The British army also did not have enough artillery.