At the opening of the American Revolution, Lew's skills and talents were called upon again, and on May 6, 1775, he enlisted in Captain John Ford's Company, 27th Regiment, Chelmsford, Massachusetts.
General George Washington, Commander-in-Chief, excluded African Americans from serving in the Continental Army, until finally on January 2, 1778, Washington responded to a letter from General James Mitchell Varnum (born in Dracut, Massachusetts and brother of Joseph Bradley Varnum) recommending that Rhode Island's troop quota should be completed with blacks.