Which general order of a sentry states that you are "to talk to no one, except in the line of duty"?

The general order of a sentry that states you are "to talk to no one, except in the line of duty" is the Seventh General Order. This order emphasizes the importance of maintaining focus and authority while on duty. It establishes the expectation that sentries should not engage in conversations that are not related to their responsibilities, thereby ensuring operational security and discipline. By limiting communication to only that which pertains to their duties, sentries help to maintain the integrity of their post and reduce distractions that could compromise their vigilance and effectiveness. This focus on professionalism is crucial in a military setting where the actions and communications of personnel can directly impact mission success and safety.