Battle of Bunker Hill - Geography

Geography

Boston, situated on a peninsula, was largely protected from close approach by the expanses of water surrounding it, which were dominated by British warships. In the aftermath of the battles of Lexington and Concord on April 19, 1775, the colonial militia, a force of about 15,000 men had surrounded the town, and effectively besieged it. Under the command of Artemas Ward, they controlled the only land access to Boston itself (the Roxbury Neck), but, lacking a navy, were unable to control or even contest British domination of the waters of the harbor. The British troops, a force of about 6,000 under the command of General Thomas Gage, occupied the city, and were able to be resupplied and reinforced by sea. They were thus able to remain in Boston indefinitely.

However, the land across the water from Boston contained a number of hills, which could be used to advantage. If the militia could obtain enough artillery pieces, these could be placed on the hills and used to bombard the city until the occupying army evacuated it or surrendered. It was with this in mind that the Knox Expedition, led by Henry Knox, later transported cannon from Fort Ticonderoga to the Boston area.

The Charlestown Peninsula, lying to the north of Boston, started from a short, narrow isthmus (known as the Charlestown Neck) at its northwest, extending about 1 mile (1.6 km) southeastward into Boston Harbor. Bunker Hill, with an elevation of 110 feet (34 m), lay at the northern end of the peninsula. Breed's Hill, at a height of 62 feet (19 m), was more southerly and nearer to Boston. The town of Charlestown occupied flats at the southern end of the peninsula. At its closest approach, less than 1,000 feet (305 m) separated the Charlestown Peninsula from the Boston Peninsula, where Copp's Hill was at about the same height as Breed's Hill. While the British retreat from Concord had ended in Charlestown, General Gage, rather than immediately fortifying the hills on the peninsula, had withdrawn those troops to Boston the day after that battle, turning the entire Charlestown Peninsula into a no man's land.