The Siege of Boston started after the battles of April 19, 1775, and Massachusetts Militia followed British troops back to Boston. In the days that followed, militia from New Hampshire, Connecticut, and Rhode Island joined Massachusetts to confine the British to the city. The siege lasted from April 19, 1775, until March 17, 1776. It was part of the Boston Campaign and included the Battle of Bunker Hill and the Fortification of Dorchester Heights. It ended in an American victory when the British evacuated the city.