Historian David Henige takes issue with the supposed population and warrior counts. Caesar claims that he could estimate the population of the Helvetii because in their camp there was a census, written in Greek on tablets, which would have showed 263,000 Helvetii and 105,000 allies, of whom exactly one quarter (92,000) were combatants. But Henige points out that such a census would have been difficult to achieve by the Gauls, that it would make no sense to be written in Greek by non-Greek tribes, and that carrying such a large quantity of stone or wood tablets on their migration would have been a monumental feat. Henige finds it oddly convenient that exactly one quarter were combatants, suggesting that the numbers were more likely exaggerated by Caesar than counted by census. Even contemporary authors estimated the population of the Helvetii and their allies was lower; Livy surmised that there were 157,000 overall (though Henige still believes this number is inaccurate). Hans Delbrück estimates that there were at most 20,000 migrating Helvetii, of whom 12,000 were warriors. Gilliver thinks there were no more than 50,000 Helvetii and allies.