Caernarfon's defences pose a linked operational problem. An attacker cannot safely hold the town without neutralizing the castle, yet cannot starve the castle while the town and waterfront remain open. Failure to seize both quickly allows food, troops, and other support to arrive by sea. This is deterrence in maritime form: the fortress does not need to attack first because its logistics raise the cost and risk of offensive action. A local prince or lord must therefore calculate whether enough troops and intelligence are available to overwhelm the whole system before reinforcement arrives. Naval access gives the land fortification much of its strategic resilience.
Notable Point · 20:19-22:25
Town, castle, and sea supply
Mutual support between the town and castle, backed by sea supply, forces an attacker to win quickly before reinforcement turns a rising into a prolonged siege.