The ruler of the Ottoman Empire province of Algiers, Omar Agha, signs a treaty with the British following the British-Dutch naval bombardment of Algiers. Agha promises to stop the enslavement of Europeans by Barbary Coast slavers. He also frees 1,083 of an eventual 3,000 Europeans enslaved in Algiers, and he returns £80,000 ransom money that he received to free earlier slaves. British casualties are high, with 16% of the invading force killed or wounded. This is the only time during a century of British combat missions to end the slave trade when a large number of British casualties occur.