Under Reed, the regiment saw action on 17 June 1775, at the Battle of Bunker Hill, which is more properly known as the Battle of Breeds Hill. There they were on the field at two locations. The bulk of the regiment was at the rail fence positioned between John Stark's 1st New Hampshire Regiment which extended on the fence to the Mystic River and Thomas Knowlton's company of Connecticut militia. One company, under Josiah Crosby of Wilton, New Hampshire, was detached into Charlestown to snipe at the British Marines as they advanced on the redoubt where the bulk of the American forces were deployed.