Final answer:
The defeat of the Gallic cavalry had a significant impact on the Gauls, causing their forces to break down and leading to their ultimate defeat against the Romans.
Explanation:
Loss of the Gallic cavalry impacted the Gauls the most after Vercingetorix's failed attack on the Romans in Chapter 67. The defeat led to the breakdown of the Gallic forces, causing chaos and confusion among their ranks. It allowed the Romans to gain a significant advantage, leading to the ultimate defeat of the Gauls.
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