Why were they fighting over bunker hill?

On June 17, 1775 British regulars faced an assemblage of independently minded colonial militia at the Battle of Bunker Hill. By evening of that day the British held the Charlestown peninsula, and a new respect for the determination and resourcefulness of colonial forces. The colonials, if shaken from what was for many the first taste of war (and what it reveals of men's character), had proven to themselves that in direct confrontation they could thwart the British army, a force superior in training, equipment, and organization.