The siege of Cattaro was fought between a British Royal Naval detachment and Montenegrin forces under Captain William Hoste, John Harper and Petar I Petrović-Njegoš respectively and the French garrison under command of Jean-Joseph Gauthier of the mountain fortress of Cattaro (now Kotor, Montenegro). The siege lasted from 14 October 1813 to 3 January 1814 during the Adriatic campaign of the Napoleonic Wars when the French surrendered. The engagement was fought in the Adriatic Sea for possession of the important fortress of Cattaro.