LAGOS, a country of Western Africa, between Dahomey and Benin. The capital, Lagos, a place of considerable population, was long one of the principal ports of the slave-trade. In November 1851, a small British force attacking the place was repulsed with loss; about a month later a better organized assault resulted in the reduction of the town and the capture of 57 guns. A treaty securing the abolition of the slave-trade, and other important benefits, was concluded soon after.