Human: When did the British Army first use the bayonet? Assistant: 
The bayonet was first used in the Battle of Waterloo in 1815. The British army was led by the Duke of Wellington, and the Prussian army was led by the Duke of Brunswick. The battle took place in Belgium near the village of Waterloo. The British army was outnumbered and outgunned, and the Prussians were equipped with modern weapons. The British army had a reputation for being the best infantry in the world, and they had a reputation for being able to fight with their bayonets.