What should a sentry do if an instruction is not covered by their orders?

A sentry is responsible for maintaining security and following specific orders, and when an instruction is not covered by their orders, the correct course of action is to call the corporal of the guard or officer of the deck. This ensures that any ambiguous situations are handled correctly and in accordance with established protocols.

Sentries may not have the authority or knowledge to make decisions outside the scope of their orders, so seeking guidance from a superior ensures that the response is appropriate and complies with the broader security measures in place. It is crucial for the safety and security of the area being guarded that directly addressing uncertainties with an authority provides clarity and maintains order.

In contrast, waiting for further instructions can lead to delays that might compromise security. Acting autonomously without instructions could lead to decisions that are potentially incorrect or harmful, while consulting a post guide may not always provide the answers needed in an urgent situation. Therefore, communicating with a superior is the safest and most effective approach.