Which effect occurred when Roman siege engineers undermined city walls during asymmetric warfare?

💡 Explanation

When undermining city walls, stress concentration occurs because removal of supporting soil at a localized section creates a cantilever load, causing the stone blocks to exceed shear strength. Therefore, wall shear failure results, rather than ramp collapse, sally port closure, or drawbridge jamming, which involve other conditions or features.

• Which outcome accelerates depletion of soil nitrogen on pre-Columbian chinampas with intensive maize farming?
• Which mathematical challenge complicated 9th-century Islamic engineers' irrigation canal designs within complex curved terrains?
• Which consequence results from excessive soil acidity prevalent in some areas during early maize cultivation terraces?
• During the Bronze Age collapse, which outcome was driven by scarcity altering weapon effectiveness?
• Which risk increases when a Roman aqueduct's arcade bridge is constructed with significantly undersized voussoirs at the crown?
• Which outcome resulted from the deliberate flooding of chinampas during the dry season?