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 40 vessels and some 1,000 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 must be done to expel the invaders.

But ineptitude and irresolution lead to a mortifying defeat - and have stunning repercussions for two men on opposite sides: an untested 18-year-old Scottish lieutenant named John Moore, who will begin an illustrious military career; and a Boston silversmith and patriot named Paul Revere, who will face court-martial for disobedience and cowardice.

Grounded firmly in history, inimitably told in Cornwell's thrilling narrative style, The Fort is the extraordinary novel of this fascinating clash between a superpower and a nation in the making.