June 17, 1775

British forces advance against colonial positions on the heights overlooking Boston, engaging entrenched militia in a sustained assault. The fighting is close and repeated, with lines forming and breaking as the ground is contested.

Colonial forces have fortified the high ground to challenge British control of the town and harbor. The attack tests both sides under direct engagement, with heavy losses as the position is finally taken.

The advance succeeds, but at a visible cost.