Britain intervened in the Lagos kingship power struggle by bombarding Lagos in 1851, deposing the slave-trade-friendly Oba Kosoko, helping to install the amenable Oba Akitoye and signing the Treaty between Great Britain and Lagos on 1January 1852. Britain annexed Lagos as a crown colony in August 1861 with the Lagos Treaty of Cession. British missionaries expanded their operations and travelled further inland. In 1864, Samuel Ajayi Crowther became the first African bishop of the Anglican Church.