Voyage down the Hydaspes (continued). When he had made all the necessary preparations the army began to embark at the approach of the dawn; while according to custom he offered sacrifice to the gods and to the river Hydaspes, as the prophets directed.736 When he had embarked he poured a libation into the river from the prow of the ship out of a golden goblet, invoking the Acesines as well as the Hydaspes, because he had ascertained that it is the largest of all the rivers which unite with the Hydaspes, and that their confluence was not far off. He also invoked the Indus, into which the Acesines flows after its junction with the Hydaspes. Moreover he poured out libations to his forefather Heracles, to Ammon,737 and the other gods to whom he was in the habit of sacrificing, and then he ordered the signal for starting seawards to be given with the trumpet. As soon as the signal was given they commenced the voyage in regular order; for directions had been given at what distance apart it was necessary for the baggage vessels to be arranged, as also for the vessels conveying the horses and for the ships of war; so that they might not fall foul of each other by sailing down the channel at random. He did not allow even the fast-sailing ships to get out of rank by outstripping the rest. The noise of the rowing was never equalled on any other occasion, inasmuch as it proceeded from so many ships rowed at t............