Note 437 — Chapter XCIV · MILITARY OPERATIONS AND CONQUESTS OF ALEXANDER, AFTER HIS WINTER-QUARTERS IN PERSIS, DOWN TO HIS DEATH AT BABYLON.
Reading edition
Arrian, iii. 24, 1. ἤδη γὰρ αὐτῷ καὶ ἱππακοντισταὶ ἦσαν τάξις.
See the remarks of Rüstow and Köchly upon the change made by Alexander in his military organization about this period, as soon as he found that there was no farther chance of a large collected Persian force, able to meet him in the field (Geschichte des Griech. Kriegswesens, p. 252 seq.).
The change which they point out was real,—but I think they exaggerate it in degree.