Which risk greatly increased during Roman ballista operation near fortress walls facing counter-fire scenarios?

💡 Explanation

Extended ballista usage caused repeated arm stressing, therefore torsion spring failure increased due to material fatigue under sustained tension, because localized heating weakened molecular structure rather than other issues like aiming or fuel.

• Which difficulty emerges in historical analysis when relying solely on translated accounts which reference Inca quipu?
• Which outcome arises when lead contamination affects the crafting process of an astrolabe's sighting vanes?
• Which risk escalates when early suspension bridge anchors use poorly-sorted stone?
• Which consequence resulted from Roman siege towers exceeding design height limits?
• Which outcome threatens Inca terrace wall stability following intense rainfall?
• Which consequence results when excessive sediment accumulated within Aztec chinampas?