Don't really know I do know though that after Ceasar conquered Gaul he enslaved about a quarter of the population which was roughly a million Gauls. How many they brought back I do not know. Try google they might be able to help
Instead of wasting your time trying to bum answers to your homework, get your sorry arse down to the library and do your own research. If you can't be bothered to move from your computer, do the research through google. Someone, within the last couple of days asked about poor students?