Which vulnerability arises when design choices impede proper interlocking and compaction during Roman castra wall construction?

💡 Explanation

When adequate interlocking and compaction are not achieved in castra walls, void spaces and discontinuities increase because soil mechanics principles dictate that a dense, cohesive structure better resists external forces. Undermining becomes easier. Therefore increased susceptibility to undermining results, rather than thermal cracking, projectile damage, or weathering which involve different mechanisms.

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