acquainted with the locality,[617] and sent him by night to Ptolemy, carrying a letter, in which it was written that as soon as the king attacked the rock, Ptolemy was to come down the mountain upon the barbarians, and not be contented with holding his position in guard; so that the Indians, being assailed from both sides at once, might be in perplexity what course to pursue. Accordingly, starting from his camp at daybreak, he led his army up the path by which Ptolemy had ascended by stealth, entertaining the opinion that if he could force his way in this direction and join his forces with those of Ptolemy, the work would no longer be difficult for him; and so it turned out. For until midday a smart battle was kept up between the Indians and the Macedonians, the latter striving to force a way of approach, and the former hurling missiles at them as they ascended. But as the Macedonians did not relax their efforts, advancing one after another, and those who were in advance rested till their comrades came up, after great exertions they gained possession of the pass early in the afternoon, and formed a junction with Ptolemy’s forces. As the whole army was now united, Alexander led it thence against the rock itself. But the approach to it was still impracticable. Such then was the result of this day’s labours. At the approach of the dawn he issued an order that each soldier individually should cut 100 stakes; and when this had been done he heaped up a great mound against the rock, beginning from the top of the hill where they had encamped. From this mound he thought the arrows as well as the missiles launched from the military engines would be able to reach the defenders of the rock. Every one in the army assisted him in this work of raising the mound; while he himself superintended it, as an observer, not only commending the man who completed his task with zeal and alacrity, but also chastising him who was dilatory in the pressing emergency. CHAPTER XXX. CAPTURE OF AORNUS.—ARRIVAL AT THE INDUS.