While the major fighting of the war moves to the south in the summer of 1779, a British force of fewer than a thousand Scottish infantry, backed by three sloops-of-war, sails to the desolate and fog-bound coast of New England. Establishing a garrison and naval base at Penobscot Bay, in the eastern province of Massachusetts that would become Maine, the Scots—the only British troops between Canada and New York—harry rebel privateers and give shelter to American loyalists. In response, Massachusetts sends a fleet of more than forty vessels and some one thousand infantrymen to “captivate, kill or destroy” the foreign invaders. Second in command is Peleg Wadsworth, a veteran of the battles at Lexington and Long Island, once aide to General Washington, and a man who sees clearly what...