Voyage down the Indus. After instructing Hephaestion to fortify the citadel in Patala, he sent men into the adjacent country, which was waterless, to dig wells and to render the land fit for habitation. Certain of the native barbarians attacked these men, and falling upon them unawares slew some of them; but having lost many of their own men, they fled into the desert. The work was therefore accomplished by those who had been sent out, another army having joined them, which Alexander had despatched to take part in the work, when he heard of the attack of the barbarians. Near Patala the water of the Indus is divided into two large rivers, both of which retain the name of Indus as far as the sea. Here Alexander constructed a harbour and dockyard; and when his works had advanced towards completion he resolved to sail down as far as the mouth of the right branch of the river.774 He gave Leonnatus the command of 1,000 cavalry and 8,000 heavy and light-armed infantry, and sent him to march through the island of Patala opposite the naval expedition; while he himself took the fastest sailing vessels, having one and a ............