During the Saratoga campaign of 1777, he led the bulk of his regiment in the withdrawal from Fort Ticonderoga. They successfully delayed the British at the Battle of Fort Ann on July 8. Very soon thereafter, their enlistment terms expired, and most of the regiment was discharged. Long and a few of his men fought as volunteers in the Battle of Saratoga as a part of Enoch Poor's brigade. But, by the end of the year, he returned home to Portsmouth. He was confined to his home for nearly half a year by illness before resuming his mercantile activities.