William Prescott was an American colonel in the Revolutionary War who commanded the patriot forces in the Battle of Bunker Hill. Prescott is known for his order to his soldiers, "Do not fire until you see the whites of their eyes", such that the rebel troops may shoot at the enemy at shorter ranges, and therefore more accurately and lethally, and so conserve their limited stocks of ammunition. It is debated whether Prescott or someone earlier coined this memorable saying.

The Battle of Bunker Hill was fought on June 17, 1775, during the Siege of Boston in the first stage of the American Revolutionary War. The battle is named after Bunker Hill in Charlestown, Massachusetts, which was peripherally involved. It was the original objective of both the colonial and British troops, though the majority of combat took place on the adjacent hill which became known as Breed's Hill.