Ba Cụt and his forces fought the Vietnamese National Army (VNA), the Việt Minh, and the Cao Đài religious movement from 1943 until his capture in 1956. Known for his idiosyncrasies, he was regarded as an erratic and cruel leader who fought with little ideological purpose. His sobriquet came from the self-amputation of his left index finger (although it was erroneously reported that it was his middle or "third cut finger"). He later swore not to cut his hair until the communist Việt Minh were defeated. Ba Cụt frequently made alliances with various Vietnamese factions and the French. He invariably accepted the material support offered in return for his cooperation, and then broke the agreement—nevertheless, the French made deals with him on five occasions. The French position was weak because their military forces had been depleted by World War II, and they had great difficulty in re-establishing control over French Indochina, which had been left with a power vacuum after the defeat of Japan.