Which increased risk resulted from undermining a medieval castle wall?

💡 Explanation

Undermining destabilizes structural integrity because the *load redistribution* concentrates stress onto remaining supports. Therefore, the risk of catastrophic collapse is increased, rather than phenomena involving pressure, oxidation, or thermal strain on the walls.

• Which consequence occurred when longship planks experienced over-tensioned lashing?
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• When the Roman army weakened an enemy city wall using undermining, which effect determined the wall's eventual collapse rather than immediate failure?