What should be done according to General Order 4?

General Order 4 states that a sentry should repeat all calls from posts that are distant from their own, ensuring clear and effective communication throughout the area of responsibility. This directive emphasizes the importance of maintaining situational awareness and ensuring that information is accurately conveyed between different posts.

Effective communication is crucial in maintaining security and operational readiness. By repeating calls, a sentry can help guarantee that commands or alerts from distant locations are acknowledged and acted upon promptly. This can prevent miscommunication that may lead to confusion or operational failures.

In the context of the other options, they do not align with the specific duties outlined in General Order 4. Quitting a post due to tiredness compromises security. Reporting to a commanding officer does not pertain to the immediate duties of a sentry in the context of communication with distant posts. Talking only in the line of duty is important, but it relates more to maintaining decorum than specifically addressing the actions required when calls are received from distant posts.