After ferrying thousands of regulars across Boston Harbor, General William Howe begins his attack on Bunker and Breed's Hills late afternoon on the afternoon of June 17, 1775. The regulars launch three bloody assaults to dislodge the provincial troops before the British break the American lines.
The provincials retreat only after running out of ammunition. They lose nearly 450 soldiers, including General Joseph Warren. The British take more than twice that number in casualties, far more than they ever thought the militia could inflict on them. It is the bloodiest day of the war for the British army. The carnage prevents the British from taking any further major offensive operations from Boston.