Why did the British want to capture Bunker Hill?

THe general William Howe and his troops defeated the Americans at the fight of Bunker Hill in 1775.

British General William Howe lands his troops on the Charlestown Peninsula overlooking Boston, Massachusetts, and leads them against Breed's Hill, a fortified American position just below Bunker Hill, on this day in 1775 ... After reforming his lines, Howe attacked again, with much the same result.