Caesar's only eyewitness account of the battle of Alesia is biased, but he accurately portrays the dangerousness of the situation. Caesar and his cavalry defeat the Gauls and turn the tide of the battle, forcing the enemy to head back uphill dejectedly.
Vercingetorix's rebellion against Julius Caesar comes to a head with the siege of Alesia, resulting in a brutal standoff between two armies that lasts for weeks, during which the citizens of Alesia suffer immensely.
The Gauls set fire to Rome and start a siege, resulting in the famous incident where a Roman complains about doctored weights, to which the Gauls respond by throwing a sword on their side of the scale and proclaiming "woe to the vanquished."
The Romans created a political structure that was able to survive even in times of disastrous military defeats. The ruling class, along with the middle and rich classes, were the ones who actively participated in wars.
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With the hostages now in the hands of the rebels, the balance of power and authority in Gaul could shift. The rebels could use the hostages as leverage to gain favor with other Gallic tribes or play hardball against Caesar with their newfound advantage.