Acquasanta Joe 1971 (Action, Western) Jobless soldiers

At the end of the American Civil War, jobless soldiers sometimes form gangs, and one is led by a former colonel, still using his weapon of choice: an Army cannon. When they rob Acquasanta Joe's life-savings, the killer goes after them in earnest, sometimes using other killers as temporary friends,all after the gold prize. Estella provides Joe with information, and some companionship--as a silver prize that comes between Joe and the colonel. Will Joe's bow-and-arrow be enough against a cannon?