Which risk increased due to use of ballista siege engines to breach castle walls during the Middle Ages?

💡 Explanation

As ballista siege engines became used, the kinetic energy from projectiles concentrated significant force at single points on castle walls, creating pathways that bypass overall wall strength. This process is named ‘stress concentration’. Therefore reduced structural integrity of masonry resulted from ballista use, rather than fungal growth, vane repair, or decreased crop yield which occur due to unrelated factors.

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