 In March 1945, Japan, which had invaded and occupied French Indochina in 1941 during World War II, decided to take direct control and overthrew the French colonial regime. Thơ was thrown into a crowded cell with several other prisoners that had no light or toilet and filled with their own excrement. One of his cellmates was Dương Văn Minh, then a junior officer in the French military forces with whom he would work over the next two decades. Thơ was released first and lobbied to have Minh released as well and the pair remained close friends.
