Which structural failure mechanism most jeopardized undermining operations during Roman sieges of walled cities?

💡 Explanation

During Roman sieges, undermining involved tunneling under walls; roof collapse from insufficient propping was a major hazard because collapses lead to entrapment and exposure. Therefore, the roof collapse during tunneling was the most jeopardizing factor for undermining operations, rather than flooding, suffocation, or detection which rely on other parameters.

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