Final answer:
The correct general order for a sentry to challenge all persons on or near their post is General Order #11.
Step-by-step explanation:
The question asks about a specific general order of a sentry. In military terms, a sentry is a guard or watch, particularly a soldier or sailor on guard duty. The general order in question pertains to the sentry's responsibility to challenge all persons on or near their post to ensure the security of the area they are protecting. The correct answer is General Order #11, which traditionally covers challenging all persons on or near the sentry's post. This order ensures that only authorized personnel are allowed access to secure areas, and helps maintain the overall security posture of a military unit.