Which risk increased when Roman fortresses transitioned from wood palisades to stone walls?

💡 Explanation

When fortifications used stone instead of wood, foundation settlement risk increased because the heavier stone walls exerted greater stress on the underlying soil, making differential settling potentially causing cracking or collapse. Therefore, structural instability results, rather than fire susceptibility, ram vulnerability or reduced visibility, due to wood being flammable, stone more easily pulverized, and wall height and width controlling arc of site respectively.

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