The date a fort was first built does not establish whether its defenses are obsolete. Pendennis and St Mawes received new weapons, garrisons, and defensive works whenever the balance of risk and reward required it, including during World War II. Modern examples in Finland and Sweden show that coastal fortification can survive in less conspicuous forms. Hypothetical arrangements include remote weapon stations and protected spaces where infantry can shelter with armored personnel carriers before deploying. Prepared roadside positions could also support mobile anti-ship missiles, adapting the old principle of a fortified position to weapons with greater range.
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Old coastal fortifications can adapt to new weapons
Repeated upgrades kept old forts useful, while modern coastal defenses can combine concealed troops, remote weapons, and prepared missile positions.