Which risk most intensified during the Siege of Alesia when Vercingetorix attempted to resupply the besieged force within the Roman fortifications?

💡 Explanation

Two concentric fortifications created a higher risk of two-front warfare because the Roman army was forced to not only lay siege to Alesia but also defend against the relieving Gallic armies, therefore the Roman's resources were strained on two fronts rather than one.

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