Following are the units and commanders involved in the Hainan Island Operation, fought 10 February 1939 as part of a campaign by the Empire of Japan during the Second Sino-Japanese War to blockade the Guangdong mainland of the Republic of China and prevent it from communicating with the outside world and from receiving imports of much-needed arms and materials.

Hainan Conquest Forces
Vice Admiral Kondō Nobutake

Defense of Hainan
Wang Yi

5th Security Brigade – Wang Yi

2 Security Regiments – About 1,600 men

7 Guard Battalions (newly formed from residents) – 1,750 men

Communist Independent Battalion – 300 men

Xiuying Battery Garrisons (still undergoing organization) – 250 men

Guo Rugui, ed. (July 2005). China's Anti-Japanese War Combat Operations. Jiangsu People's Publishing House. ISBN 7-214-03034-9.