Which General Order requires a sentry to remain vigilant and alert?

The 2nd General Order emphasizes the importance of a sentry being vigilant and alert while on duty. This order specifically states that the sentry must "walk my post in a military manner, keeping always on the alert and observing everything that takes place within sight or hearing." This accentuates the critical role of attentiveness, as it reinforces the expectation that the sentry must be aware of their surroundings and ready to respond to any situation that might arise. Maintaining vigilance is essential for the security and safety of the area being monitored, and it ensures that the sentry can effectively carry out their responsibilities. Other General Orders may pertain to different duties or aspects of sentry responsibilities, but the focus on maintaining alertness and awareness is distinctive to the 2nd General Order.