Which vulnerability led to breaches in Roman siege towers if defenders ignited flammable materials at their base?

💡 Explanation

When flammable materials burned, the heat transfer into the tower's wooden structure caused charring because increasing temperature reduces the strength, stability, and load-bearing capabilities of main structural wood components which weakened and later structural collapse. Therefore tower collapse resulted, rather than wheel deformation, asphyxiation, or projectile issues that required dissimilar mechanisms.

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