Which vulnerability in Roman scutum designs significantly affected legionary formations exposed to fire arrows?

💡 Explanation

When fire arrows struck, burning glue caused delamination of the scutum's layered linen and wood because heat compromised the adhesive bond. Therefore flammable glue weakening layers was a major vulnerability, rather than metal warping, handle breakage, or weight increase, which represent different failure mechanisms caused by other stressors.

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