sentences:  Local Kuomintang commander Captain Yin Tsu-Ch'ien met with Japanese forces and agreed to turn over his fleet of five river gunboats to the Imperial Japanese Navy in Harbin on 15 February 1932.This flotilla formed the core of the Sungari River Defense Fleet (江防艦隊) under the State of Manchuria.The Manchukuo Imperial Navy was established on 15 April 1932, by the proclamation of the "Manchukuoan Armed Forces Act" by Emperor Pu Yi, who also assumed the role of supreme commander.