Patrols, and more patrols. Static defenses will help you hold the town, protecting it and preserving it as a productive asset requires a commander to make an active defense in depth. You set up firebases and LP/OPs on key commanding terrain that covers the available avenues of approach, and patrol those same routes.
This works to deter or destroy opposing forces that have parity or less. If the attackers have superior numbers or the motivation to take losses, you are forced to either give battle in the open hoping to drive off his forces, or fall back on your prepared defenses which yields him the initiative and risks exposing the town to damage in the fighting to come.
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Living reactionary fossil says; "Honor is the duty we owe to ourselves, and pity those who have nothing worth dying for, for what is it that they live for?"
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