Sailing thus, he stopped on the third day at the spot where he had instructed Hephaestion and Craterus to encamp on opposite banks of the river at the same place. Here he remained two days, until Philip with the rest of the army came up with him. He then sent this general with the men he brought with him to the river Acesines, with orders to march along the bank of that river. He also sent Craterus and Hephaestion off again with instructions how they were to conduct the march. But he himself continued his voyage down the river Hydaspes, the channel of which is nowhere less than twenty stades broad. Mooring his vessels near the banks wherever he could, he received some of the Indians dwelling near into allegiance by their voluntary surrender, while he reduced by force those who came into a trial of strength with him. Then he sailed rapidly towards the country of the Mallians and Oxydracians, having ascertained that these tribes were the most numerous and the most warlike of the Indians in that region; and having been informed that they had put their wives and children for safety into their strongest cities, with the resolution of fighting a battle with him, he made the voyage with the greater speed with the express design of attacking them before they had arranged their plans, and while there was still lack of preparation and a state of confusion among them. Thence he made his second start, and on the fifth day reached the junction of the Hydaspes and Acesines. Where these rivers unite, one very narrow river is formed out of the two; and on account of its narrowness the current is swift. There are also prodigious eddies in the whirling stream, and the water rises in waves and plashes exceedingly, so that the noise of the swell of waters is distinctly heard by people while they are still far off. These things had previously been reported to Alexander by the natives, and he had told his soldiers; and yet, when his army approached the junction of the rivers, the noise made by the stream produced so great an impression upon them that the sailors stopped rowing, not from any word of command, but because the very boatswains who gave the time to the rowers became silent from astonishment and stood aghast at the noise. CHAPTER V. VOYAGE DOWN THE ACESINES.