The Chōshū clan was equipped with mostly antiquated cannon firing round shot, but also some modern armament, such as five 8 inches Dahlgren guns which had been presented to Japan by the United States and three steam warships of American construction: the barque ship Daniel Webster barque 2 of six guns, the brig Kosei of ten guns (originally named ship Lanrick ), and the steamer Koshin of four guns (originally Lancefield).