Explanation:

The American forces learned that the British were planning on taking over the hills around Boston in order to gain a tactical advantage. As a result of this information, the Americans secretly moved their troops onto Bunker and Breed's Hill, two unoccupied hills just outside of Boston in Charlestown, Massachusetts. They built up fortifications during the night and prepared for battle.

The next day, when the British realized what had happened, the British attacked. Their commander William Howe led three charges up Breed's Hill. The Americans fought back the first two charges, but started to run out of ammunition and had to retreat at the third charge. The British gained the hill, but their costs were great. Around 226 British were killed and 800 wounded while the Americans did not suffer nearly as many casualties.