During Roman sieges, which outcome arose from concentrated catapult fire eroding supporting soil around a city wall's base?

💡 Explanation

When catapults targeted the base of a city wall, undermining occurs via soil erosion because the bombardment displaced the supporting earth ,leading to ground subsidence. Therefore localized wall collapsing result, rather than fire spread, gate weakening, or water contamination, which depend on different forms of attack.

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