The UK made efforts to end the Slave trade through the West Africa Squadron[9] In 1827, Britain, jointly with France and Russia, intervened on the side of Greek independence, destroying the Turkish fleet at the Battle of Navarino. In 1854, Britain, jointly with France, prevented Russia from destroying the Ottoman Empire. Russia had to withdraw from Moldavia and Wallachia, and Sevastopol was besieged in the Crimean war.