What action should a sentry take in the case of fire or disorder?

In the context of a sentry's duties, the most appropriate action to take in the event of a fire or disorder is to give the alarm. This is critical because raising the alarm ensures that others are alerted to the potential danger and can take the necessary actions to respond appropriately. In situations involving fire or disturbances, timely communication can prevent injury and mitigate damage.

Giving the alarm typically involves notifying fellow personnel, activating fire alarms, or utilizing any available communication systems to inform emergency services. The goal is to coordinate an effective response to ensure safety and security in the area.

While calling for help may seem like a viable option, it is often encompassed within the act of giving the alarm, which prioritizes alerting everyone immediately rather than waiting for assistance. Remaining silent would be counterproductive as it would prevent others from being aware of the situation and the potential risks involved. Leaving the post is not an advisable action as it may expose the area to greater risk or leave it unguarded, thus failing the duty of care that a sentry holds. Therefore, giving the alarm is the best practice to follow in such scenarios.