During the [[Sino-Japanese War]] of 1937-1945 around one-third of the adult male population perished in the course of resistance by [[Communist]] guerilla forces to the [[Japanese]] occupiers. In 1945 [[Guomindang]] forces reoccupied Hainan, and it did not fall to the Communists until May 1950. | During the [[Sino-Japanese War]] of 1937-1945 around one-third of the adult male population perished in the course of resistance by [[Communist]] guerilla forces to the [[Japanese]] occupiers. In 1945 [[Guomindang]] forces reoccupied Hainan, and it did not fall to the Communists until May 1950. |