Son of the Guardsman is a 1946 Columbia film serial. It was the 31st of the 57 serials produced by that studio.
Set in the middle ages, Sir Edgar Bullard conspires to conquer England. In doing so, he kidnaps the daughter of his rival, Lord Markham. This causes his nephew, David Trent, to turn against him and join the outlaws in Sherwood Forest, who led by Allan Hawk. Meanwhile, the outlaws of the forest support the usurped Prince Richard as the rightful ruler of England, who has been usurped by the regent Lord Hampton.Son of the Guardsman is based on the Robin Hood legends, although it does not include Robin Hood, just the period and Sherwood Forest setting. The serial was made to use costumes and sets left over from feature films. Amortising the costs of all the productions involved. Costume drama serials were rare productions for any producer. The serials subitle was Gallant Fighter of the Greenwood. ........
Source: Wikipedia