Analysis of information sources in references of the Wikipedia article "Douglas O-2" in English language version.
14 October 1937, at 16:00, 18 Chinese aircraft (three Martin 139WCs, two Heinkel He111s, five Douglas O-2MCs, three Hawk IIIs and five Northrop Gammas) took off from Nanking to attack Shanghai airfields and warehouses; five Japanese bombers escorted by five fighters, arrived about five minutes after the Chinese attack force took off... barely escaping the raid by... the Japanese planes bombed the vacant airfield without inflicting much damage. Starting at 21:00, one aircraft was sent every hour for night-bombing runs on Japanese targets in Shanghai until 03:00 on 15 October 1937.
On 26th August 1937, 2Lt. Peng Ren-bian flew a Douglas O2MC from Hangzhou, Zhejiang Province to Shanghai to raid Japanese forces, and accomplished the mission over the target area. While flying back, he was suddenly attacked by multiple hostile aircraft, and killed in the skies over Lin'an of Zhejiang. He was given a posthumous promotion to the rank of first lieutenant, and was survived by his parents and wife.
