What is the essence of the third general order?

The essence of the third general order emphasizes the importance of vigilance and accountability in a military environment. This order states that a sentry must report any violations of orders they are tasked with enforcing. The key aspect here is the responsibility that comes with being in a position of authority and the necessity for active communication regarding rule enforcement. This reflects the paramount importance of maintaining order and discipline which is central to military operations.

The other options, while relevant to the duties of a sentry or military personnel, pertain to different aspects of military conduct. The first option focuses on the manner in which one should walk their post, highlighting discipline but not the reporting aspect. The second choice addresses the responsibility of guarding the post and property, emphasizing ownership rather than communication. The final option relates to the proper protocol for vacating a post, which is about adherence to procedure rather than the reporting of violations. Thus, the third general order underscores the proactive role required in maintaining security and order by ensuring that any infractions are promptly reported.