Which risk increased substantially for European knights facing Genoese crossbowmen when using newly common cast iron helmet reinforcements?

💡 Explanation

Heat treatment options lagged behind cast iron production; impact energy increased structural brittleness, therefore splintering upon impact. Rather than deflection or oxidation, the thermal embrittlement caused failure because impact strength was low.

• Which outcome results when bronze smelting lacked precise temperature control around 1200 BC?
• Which structural failure mode reduces the long-term stability of Mesopotamian Ziggurats during seismic events?
• Which outcome resulted from using specific gravity within Fatehpur Sikri's water system?
• Which long-term consequence arises when mineral-rich water flows continuously through a Roman aqueduct constructed with porous limestone?
• Which consequence resulted from Vitruvius's road alignment deviations?
• Which catastrophic consequence increases on long sea voyages if proper hull maintenance of a 18th-century wooden ship is neglected?