McNieill states that this was based on the capture of the diary of the battle commander Nguyen Thoi Bung according to Ernest Chamberlain this has not yet been corroborated by actual documentation .
Nguyen Thoi Bung later became the Deputy Defense Minister of Vietnam ; however .
McNieill states that this was based on the capture of the diary of the battle commander Nguyen Thoi Bung , who later became the Deputy Defense Minister of Vietnam ; however , according to Ernest Chamberlain this has not yet been corroborated by actual documentation .