Sharpe's Siege: The Winter Campaign, 1814 (The Sharpe Series, Book 18) by Bernard Cornwell
A classic Sharpe adventure: Richard Sharpe and the Winter Campaign, 1814.
The invasion of France is under way, and the British Navy has called upon the services of Major Richard Sharpe. He and a small force of Riflemen are to capture a fortress and secure a landing on the French coast. It is to be one of the most dangerous missions of his career.
Through the incompetence of a recklessly ambitious naval commander and the machinations of his old enemy, French spymaster Pierre Ducos, Sharpe finds himself abandoned in the heart of enemy territory, facing overwhelming forces and the very real prospect of defeat. He has no alternative but to trust his fortunes to an American privateer - a man who has no love for the British invaders.