In "...rides for the 20th Cavalry," Lucky Luke is assigned as an undercover investigator by the government to find out who is supplying the Cheyenne with weapons and trying to involve them in a conflict against the 20th Cavalry Regiment. In his role as a supposed scout, he uncovers a dangerous plot orchestrated by a deserter seeking revenge on the cavalry through warlike intrigues. This thrilling story combines humor and adventure, offering readers insight into the challenges and intrigues of the Wild West. The combination of a gripping storyline and the characteristic illustrations by Morris and Goscinny makes this comic a must-have for fans of Lucky Luke and Western tales.