
Roman coin showing head Of Captive Gaul 48 BCE stuck after the Gallic Wars
As many as a million people (probably 1 in 4 of the Gauls) died, another million were enslaved, 300 tribes were subjugated and 800 cities were destroyed during the Gallic Wars.
The entire population of the city of Avaricum (Bourges) (40,000 in all) were slaughtered.
During Julius Caesar’s campaign against the Helvetii (present-day Switzerland) approximately 60% of the tribe was destroyed, and another 20% was taken into slavery.
see
en.wikipedia.org/wiki/File:RomanSilverDenariusWithHeadOfCaptiveGaul48BCE.JPG
Image credit: PHGCOM – photographed at the British Museum 2007