The Battle of the Basque Roads, also known as the Battle of Aix Roads, was a major naval battle of the Napoleonic Wars, fought in the narrow Basque Roads at the mouth of the Charente River on the Biscay coast of France. The battle, which lasted from 11 to 24 April 1809, was unusual in that it pitted a hastily assembled squadron of small and unorthodox British Royal Navy warships against the main strength of the French Atlantic Fleet. The circumstances were dictated by the cramped, shallow coastal waters in which the battle was fought. The battle is also notorious for its controversial political aftermath in both Britain and France.