Chinese sister soldiers sparring on a rocky battlefield

The Chinese sisterhood during the 2nd sino-japanese war. 1944. A chinese woman soldier in communist khaki army uniform older sister (pic 1) and a chinese woman soldier in nationalist light blue army uniform little sister (Pic 2) with their tai chi shoes have straps (Pic 3) and their puttees leg wraps that fighting each other during the practice their martial art with hand-to-hand combat sparring by punching and kicking at the rocky area in the field. They are only twenty years old. Red star icon in her khaki cap and blue sky white sun in her light blue cap. (Pic 4). Her older sister red star in her khaki cap color that use her front kick skill to kicking on her stomach and make her pain.