The Achaemenid Empire in South Asia and Recent Excavations in Akra in Northwest Pakistan Peter Magee, Cameron Petrie, Robert Knox, Farid Khan, Ken Thomas p.714
Arrian, The Anabasis of Alexander, 6.26: "Collecting this water with difficulty, they came with all speed to Alexander, as if they were bringing him some great boon. As soon as they approached the king, they poured the water into a helmet and carried it to him. He took it, and commending the men who brought it, immediately poured it upon the ground in the sight of all. As a result of this action, the entire army was re-invigorated to so great a degree that any one would have imagined that the water poured away by Alexander had furnished a draught to every man. This deed beyond all others I commend as evidence of Alexander’s power of endurance and self-control, as well as of his skill in managing an army."