The Chōshū clan was equipped with mostly antiquated cannons firing cannonballs, 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 bark Daniel Webster of six guns, the brig Lanrick, or Kosei, with ten guns, and the steamer Lancefield, or Koshin, of four guns. [