What does the Fourth Order of the Sentry require a sentry to do?

The Fourth Order of the Sentry requires a sentry to repeat calls from distant posts. This directive is crucial as it ensures clear communication and coordination between sentries and their command structure. By repeating calls, a sentry facilitates an effective relay of information, which can be critical in maintaining security and situational awareness. The ability to communicate effectively allows for timely responses to any potential threats, enhancing the overall security posture of the area being guarded.

While communication is key, the other options mentioned, such as maintaining silence, patrolling, or keeping a log, are not specific to the Fourth Order and pertain to different aspects of sentry duties. These duties may be important in their own right, but they do not encompass the essential focus of the Fourth Order, which is centered around the importance of communication and information sharing between sentries.