The Battle of Bunker Hill took place on June 17, 1775, just a few months after the start of the American Revolutionary War. The British decided to take two hills, Bunker Hill and Breed's Hill, in order to gain a tactical advantage. ... The American forces heard about it and went to defend the hills.
The battle was a tactical victory for the British, but it proved to be a sobering experience, involving more than twice the casualties than the Americans had incurred, including many officers. The battle demonstrated that inexperienced Continental militia could stand up to regular British army troops in battle.