 Sullivan was a member of the Congress of 1774 and 1775, and the following year he was appointed a brigadier general by that Congress.Scammell was with Sullivan during the Capture of Fort William and Mary on December 14, 1774.With the start of the American Revolution, Scammell became a major in the 2nd New Hampshire Regiment, which was in Sullivan's Brigade, and after the Siege of Boston was sent with them to reinforce the Continental Army units in the Invasion of Canada.