During Roman sieges, which consequence resulted from concentrated undermining beneath city walls?

💡 Explanation

When Romans undermined walls using tunnels, concentrated material removal created instability because decreased support led to exceeding the soil's shear strength, causing collapse. Therefore localized wall collapse occurred, rather than subsidence/overload requiring different soil conditions/structures, or poisoning needing specifically targeting water supplies.

• Which outcome occurred when ancient Mesopotamian bronzesmiths cast large-format objects with high tin content?
• Which mechanism limited deep-water salvage attempts of 18th-century shipwrecks when using diving bells?
• During winter, which outcome reduces the structural integrity of a Roman aqueduct's arched keystone?
• Which stabilization mechanism prevented collapse in steeply-walled Late Roman castra?
• Which constraint limited blade length during the Bronze Age sword manufacture process?
• Which vulnerability in Roman scutum designs significantly affected legionary formations exposed to fire arrows?