Which vulnerability results when sapping erodes a castle's foundation wall?

💡 Explanation

Sapping causes undermining-induced collapse of the foundational wall because removal of support concentrates stress leading to structural failure; therefore the wall fails under compression, rather than altering ballistics or water quality.

• Which risk increased when elaborate stepped water channels within Mughal gardens encountered seasonal flooding?
• Which consequence results when subsurface aqueducts feeding Mughal gardens encounter highly impermeable clay layers?
• Which consequence arises when longship sails lost strength?
• Which mechanism primarily enabled ancient rammed earth structures to withstand seismic activity?
• Which consequence results when wooden rope bridges experience excessive deflection?
• Which outcome accelerates soil degradation during the Medieval period due to intensive agricultural expansion?