I have to think that would have been alot of deaths for the population at the time. Really amazing.
If we are to believe some of the old documents, slaughter like this may have been relatively common in the days of no quarter. Even as late as the 12th Century, Edward Longshanks killed every man woman and child in the city of Berwick to put down a rebellion by the Scots.
Roman historians regularly give accounts of battles where whole armies were destroyed by Julius Caesar or Pompey for example.
And the mongols who conquered Baghdad reputedly killed 750,000 people while wiping out the city.