When did the Pacification of Manchukuo begin?
Pacification of Manchukuo
March 1932
The Pacification of Manchukuo was a Japanese anti-insurgency campaign during the Second Sino-Japanese War to suppress any armed resistance to the newly established puppet state of Manchukuo from various anti-Japanese volunteer armies in occupied Manchuria and later the Communist Northeast Anti-Japanese United Army.  The operations were carried out by the Imperial Japanese Kwantung Army and the collaborationist forces of the Manchukuo government from March 1932 until 1942, and resulted in a Japanese victory.