<human>:  Why did the British Army lose the Battle of Waterloo?
<bot>: The British Army was outnumbered by the French Army. The British army had a lot of cannons, but they were not well-coordinated. Also, the British army had a lot of cavalry, but they were not well-trained. The French had better cavalry and better artillery. The French army also had a better commander. The British army was also outnumbered in terms of infantry, and they had less discipline than the French. All of these factors combined led to the British army losing the Battle of Waterloo.