Which structural failure was a primary risk in Roman castra fortifications during prolonged siege?

💡 Explanation

During a prolonged siege, undermining, where attackers dig tunnels to collapse defensive walls, poses a major risk because soil erosion weakens the structure. Therefore rampart collapse results, rather than gate or tower failures which are results of external impacts or curtain wall cracking which requires temperature cycling.

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• Which navigational challenge increased significantly for 18th-century sailors crossing oceans, lacking precise longitude knowledge?
• Which approach did Al-Khwarizmi use when geometrically 'completing the square' within quadratic equations?
• Which outcome occurs when Roman siege engines launch projectiles that impact fortifications unevenly?
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