This is the statement of Ptolemy; who was himself concerned in the transactions, and was the officer through whom the conspiracy of the pages had been revealed. His partiality might permit him to omit or soften what was discreditable to Alexander, but he may be fully trusted when he records an act of cruelty. Aristobulus and others affirmed that Kallisthenes was put in chains and carried about in this condition for some time; after which he died of disease and a wretched state of body. But the witnesses here are persons whose means of information we do not know to be so good as those of Ptolemy; besides that, the statement is intrinsically less probable. [532] See the language of Seneca, Nat. Quæst. vi. 23; Plutarch, De Adulator. et Amici Discrimine, p. 65; Theophrast. ap. Ciceron. Tusc. Disp. iii. 10. Curtius says that this treatment of Kallisthenes was followed by a late repentance on the part of Alexander (viii. 8, 23). On this point there is no other evidence—nor can I think the statement probable. The halts of Alexander were formidable to friends and companions; his marches, to the unconquered natives whom he chose to treat as enemies. On the return of Kraterus from Sogdiana, Alexander began his march from Baktra (Balkh) southward to the mountain range Paropamisus or Caucasus (Hindoo-Koosh); leaving however at Baktra Amyntas, with a large force of 10,000 foot and 3500 horse, to keep these intractable territories in subjugation.[533] His march over the mountains occupied ten days; he then visited his newly-founded city Alexandria in the Paropamisadæ. At or near the river Kophen (Kabool river), he was joined by Taxiles, a powerful Indian prince, who brought as a present twenty-five elephants, and whose alliance was very valuable to him. He then divided his army, sending one division under Hephæstion and Perdikkas, towards the territory called Peukelaôtis (apparently that immediately north of the confluence of the Kabool river with the Indus); and conducting the remainder himself in an easterly direction, over the mountainous regions between the Hindoo-Koosh and the right bank of the Indus. Hephæstion was ordered, after subduing all enemies in his way, to prepare a bridge ready for passing the Indus by the time when Alexander should arrive. Astes, prince of Peukelaôtis, was taken and slain in the city where he had shut himself up; but the reduction of it cost Hephæstion a siege of thirty days.[534] [533] Arrian, iv. 22, 4. [534] Arrian, iv. 22, 8-12.