Then they shouted, as a mixed multitude would shout when rejoicing, and many of them shed tears. Some of them even approached the royal pavilion, and invoked many blessings on Alexander, because by them and them only did he permit himself to be vanquished. He then divided the army into brigades, which he ordered to prepare twelve altars[140] to equal in height the highest military towers, and to exceed them in point of breadth, to serve as thank-offerings to the gods who had led him so far as a conqueror, and also as a memorial of his own labours. When the altars had been constructed, he offered sacrifice upon them with the customary rites, and celebrated a gymnastic and equestrian contest. Having thereafter committed all the country west of the river Hyphasis to the government of Pôros, he marched back to the Hydraôtês. After crossing this river, he retraced his steps to the Akesinês, and on arriving there found the city which he had ordered Hêphaistiôn to fortify completely built.[141] Herein he settled as many of the inhabitants of the neighbourhood as were willing to make it their domicile, and such also of the mercenary soldiers as were now unfit for further service. He then began to make preparations for the downward voyage to the Great Sea. At this time Arsakês,[142] ruler of the country adjoining the dominions of Abisarês, together with the brother of Abisarês and his other relatives, came to him, bringing presents such as the Indians consider the most valuable, and some thirty elephants sent by Abisarês. They represented that Abisarês was prevented from coming in person by illness—a statement which the ambassadors sent by Alexander to Abisarês corroborated. Alexander, readily believing that such was the case, made Abisarês satrap of his own dominions, and moreover placed Arsakês under his jurisdiction. Having then fixed the amount which was to be paid as tribute, he again offered sacrifice near the river Akesinês. He then recrossed that river, and reached the Hydaspês, where he employed his army in repairing the damage caused by the rains to the cities of Nikaia and Boukephala, and set the other affairs of the country in order. SIXTH BOOK _Chapter I.—Alexander mistakes the Indus for the upper Nile—Prepares to sail down stream to the sea_