During a Roman siege against a walled city, which consequence arises when sappers undermine the wall, creating a void that induces instability?

💡 Explanation

Localized undermining during a siege causes Arch Keystone Displacement, removing the keystone that distributes the load and failing the arch. This collapses the wall section because compressive arch action is disrupted, therefore the wall falls rather than remaining intact despite the missing support.

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