Sleeman also acted for the defence in a second trial in Singapore, which took place in March and April 1946. In the "Double Tenth" trial, 21 members of the Kempeitai (Japanese military police) were accused of war crimes relating to the torture of 57 of prisoners (including John Leonard Wilson, Bishop of Singapore) following a raid on Changi Prison on 10 October 1943 to investigate of a suspected spy network, thought to be responsible for the sinking of seven Japanese merchant vessels in Singapore harbour in September 1943. Many were brutally tortured; one prisoner was executed; another attempted suicide, was refused medical attention, and was left to die of his wounds; and several others died afterwards. The commanding officer, Lieutenant Colonel Sumida Haruzo and seven others were sentenced to death, three to life imprisonment, and others to shorter terms of imprisonment.