Ab urbe condita

In both armies the soldiers fought in line rank by rank, but the Macedonian phalanx lacked mobility and formed a single unit; the Roman army was more elastic, made up of numerous divisions, which could easily act separately or in combination as required.

Then with regard to fatigue duty, what soldier is better able to stand hard work than the Roman? If Alexander had been worsted in one battle the war would have been over; what army could have broken the strength of Rome, when Caudium and Cannae failed to do so?