Another example of the staggering human cost of Caesar's conquest of Gaul. Also, the entire civilian population of Alesia perished during the siege. A year earlier he wiped out most of population of Belgium.
There's a reason the Romans didn't take reprisals after the siege. Much of the population of Gaul had perished in the last 10 years. There simply wouldn't have been anyone left to pay taxes or provide auxiliaries to the Roman Army.
True, but a large number of Gauls were already serfs of their own nobility, whose status was scarcely better than that of Roman slaves.