What are the differences between the characters of Gardner and Jassa in the novel, Flashman and the Mountain of Light: From the Flashman Papers, 1845-46?

While Gardner and Jassa are both American, the similarity ends there. The two men are polar opposites. Garner is brave and loyal, a trusted and dependable man. Jassa, if Gardner's account is accurate, is an opportunist who uses guile and duplicity as a means to an end.