On Guard: Mark Mallory's Celebration, published in 1903 by Upton Sinclair, is a juvenile fiction novel set at the United States Military Academy, West Point. The story follows Cadet Mark Mallory as he leads his fellow plebes in resisting the hazing practices of upperclassmen, highlighting themes of friendship, courage, and youthful rebellion. Sinclair's narrative captures the struggles and camaraderie of new cadets navigating the challenges of military life, making it a notable exploration of conduct and ethics in a rigorous environment.
