Battle of Nanking
During the Battle of Nanking in the Second Sino-Japanese War, a battalion of the 36th Division (National Revolutionary Army) was guarding the Yijiang Gate and was under orders to 'let no one through'. On December 12, 1937, the National Revolutionary Army (NRA) collapsed against the Japanese onslaught. NRA units tried to retreat without orders through the gate, and the battalion shot into the crowd, killing many people.