Quintus Curtius Rufus, History of Alexander 8.12.3

8.12.3

Indi sive odio ducis sive gratiam victoris inituri Ericen fugientem adorti interemerunt caputque eius atque arma ad Alexandrum detulerunt. Ille facto inpunitatem dedit, honorem denegavit exemplo.

Thence he marched towards Embolima, but on learning that the pass which led thereto was occupied by 20,000 men in arms under Erix, he hurried forward himself with the archers and slingers, leaving the heavy-armed troops under the command of Coenus to advance leisurely. Having dislodged those men who beset the defile, he cleared the passage for the army which followed. The Indians, either from disaffection to their chief or to court the favour of the conqueror, set upon Erix during his flight and killed him. They brought his head and his armour to Alexander, who did not punish them for their crime, but to condemn their example gave them no reward. Having left this pass, he arrived after the sixteenth encampment at the river Indus, where he found that Hephaestion, agreeably to his orders, had made all the necessary preparations for the passage across it.