Final answer:
The general order of a sentry 'Repeat all calls from post more distant than my own' ensures that communications are relayed to maintain alertness, relevant in military situations that require structured information flow and hierarchy.
Step-by-step explanation:
The general order of a sentry that is being referenced in the question 'Repeat all calls from post more distant than my own' directs the sentry to communicate certain signals or calls that are made from positions farther away from the sentry's own post. This protocol ensures that important communications are relayed throughout the military force, maintaining a network of alertness and readiness among sentinels or sentries, especially in an environment resembling the one described in the passages provided. Details involving sentinels posted at a bridge or involved in historical military contexts illustrate scenarios where such orders would be paramount for maintaining security and surveillance. Military etiquette and procedure are deeply woven into these practices, emphasizing the structured hierarchy and flow of information necessary in military operations.