According to the 9th General Order of a Sentry, what should a sentry do in cases not covered by instructions?

The ninth general order of a sentry instructs that when faced with situations not explicitly covered by existing instructions, a sentry should call the Officer of the Deck. This order emphasizes the importance of following the chain of command and ensures that any uncertainties are addressed by a superior officer who has the authority and knowledge to make decisions in those situations. It helps maintain order and proper protocol within military operations while minimizing the risk of miscommunication or error.

In this context, other options are less appropriate. Providing first aid may be important in emergency situations, but it is not specifically indicated in the ninth general order. Dismissing individuals or engaging in conversation can lead to misunderstandings and disrupt the chain of command, which the General Orders are designed to uphold. Thus, calling the Officer of the Deck is the most fitting response for situations outside the provided instructions.