In 1761, during the Seven Years' War in Europe, a British expedition against Dominica led by Andrew Rollo conquered the island, along with several other Caribbean islands. In 1763, France had lost the war and ceded the island to Great Britain under the Treaty of Paris. The same year, the British established a legislative assembly, with only European colonists represented. French remained the official language, but Antillean Creole, which had developed from it, was spoken by most of the population.