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As many as a million people (probably 1 in 5 of the Gauls) died, another million were enslaved,[24] 300 clans were subjugated and 800 cities were destroyed during the Gallic Wars.[25] The entire population of the city of Avaricum (Bourges) (40,000 in all) were slaughtered.[26] Before Julius Caesar's campaign against the Helvetii (present-day Switzerland), the Helvetians had numbered 263,000, but afterwards only 100,000 remained, most of whom Caesar took as slaves.[27]
https://en.wikipedia.org/wiki/Gaul#Conquest_by_Rome
wiki is not the best source. I would think its a higher number. Fuck ceasar. And fuck rome.