Final answer:
A sentry should follow the orders of the commanding officer, seek guidance from a senior officer, take necessary action to ensure safety and security, and report the situation to higher authorities when in doubt.
Step-by-step explanation:
The general order that a sentry should follow when in doubt is:
- Follow the orders of the commanding officer. The commanding officer is the person in charge and their orders should be followed unless they are illegal or unethical.
- Seek guidance from a senior officer. Senior officers have more experience and knowledge, so they can provide valuable guidance in uncertain situations.
- Take necessary action to ensure safety and security. If immediate action is required to maintain safety and security, the sentry should take necessary steps to address the situation.
- Report the situation to the higher authorities. It is important to inform higher authorities about any doubts or uncertainties, so they can provide further guidance and support.