in 1863, japan completed her first domestically-built steam warship, the "chiyodagata", a 140-ton gunboat commissioned into the tokugawa navy (japan's first steamship was the unkoumaru -雲行丸- built by the fief of satsuma in 1855). the ship was manufactured by the future industrial giant, ishikawajima, thus initiating japan's efforts to acquire and fully develop shipbuilding capabilities.