But when the Indians, instead of sallying out from behind their waggons to attack the cavalry as it advanced, mounted upon them, and began to shoot from the top of them, Alexander saw that this was not work for cavalry, and so, having dismounted, he led on foot the phalanx of infantry against them. The Macedonians found no difficulty in driving the Indians from the first row of waggons, but on the other hand the Indians, having formed in line in front of the second row, were able to force back their assailants with greater ease, standing as they did more compactly together, and in a narrower circle, while the Macedonians had less room in which to operate against them. At this time they quietly drew back the waggons of the first row, and through the gaps each man, as he found an opportunity, assailed the enemy in an irregular way.[128] Yet even from these waggons they were forcibly driven by the phalanx of infantry, and even at the third row they no longer held ground, but fled with all the haste they could into the city and shut themselves up within its gates. Alexander that same day encamped with his infantry around the city, as far at least as the phalanx enabled him to surround it, for the wall was of such great extent that his camp did not completely environ it. Opposite the part where the gap was left, and where also was a lake not far from the walls, he posted the cavalry all round the lake, as he knew it not to be deep, and at the same time anticipated that the Indians, terrified by their previous defeat, would abandon the city during the night. The event showed he had conjectured aright, for about the second watch the most of them dropped down from the wall and came upon the outposts of the cavalry. The foremost of them were cut to pieces by the sentinels, but those in the rear, perceiving that the lake was guarded all round, withdrew into the city. Alexander now encompassed the city with a double stockade, except where the lake shut it in, and around the lake he posted guards to keep still stricter watch. He resolved also to bring up the military engines against the place for battering down the walls. Some deserters, however, came to him from the city and informed him that the Indians intended that very night to escape from the city by way of the lake where the gap occurred in the stockade. So at that point he stationed Ptolemy, the son of Lagos, with three divisions of the hypaspists, each 1000 strong, all the Agrianians, and a single line of archers, and pointed out to him the particular spot where the barbarians, as he conjectured, were likeliest to attempt forcing their passage. “And now,” said he, “when thou perceivest the barbarians forcing their way at this point, do thou with the army arrest their advance, and order the trumpets to sound the signal; and do you, sirs,” he added, turning to the officers, “as soon as the signal is given, each of you with your men in