Kawachi was the lead ship of her class of battleships built for the Imperial Japanese Navy. Launched on 15 October 1910, she was commissioned on 31 March 1912. During the First World War, along with her sister ship Settsu, she bombarded German positions during the siege of Tsingtao. A magazine explosion on 12 July 1918 resulted in her sinking with the loss of over 600 crewmen.
Aki was the second of the two-ship class of Satsuma semi-dreadnoughts built for the Imperial Japanese Navy. Launched on 14 April 1907, she was commissioned on 11 March 1911. She saw no combat during the First World War and was disarmed in 1922 to comply with the Washington Treaty. In 1923 Aki was converted to a target ship and sunk in Tokyo Bay by battlecruiser Kongō and the battleship Hyūga on 2 September 1924.
Launched on 15 November 1906, Satsuma was a semi-dreadnought of the Imperial Japanese Navy. She was the first battleship built in Japan. Commissioned on 25 March 1910, her participation in World War One consisted of leading the squadron that occupied the German colonies of Caroline and the Palau Islands in October 1914. None of these occupations resulted in Satsuma seeing any action.
To comply with the Washington Naval Treaty, Satsuma was disarmed in 1922 and converted to a target ship. She was sunk by Mutsu and Nagato off the southern tip of the Bōsō Peninsula, near the mouth of Tokyo Bay on 7 September 1924.
