On coming in sight of the enemy Alexander made some changes in the disposition of his forces. The most important of these was to transfer some light infantry, cavalry, and archers to act against the 20,000 Persians who had been so placed as to threaten his right flank. It was a wise precaution, but, as a matter of fact, it was not needed. The Persians made no move, and Alexander soon perceived that they might be safely neglected. He left a few hundred cavalry to watch them, and placed the rest of the force destined for this service in his main line. A brief time was allowed for rest when the river was reached. It was well, too, to wait for a possible forward movement on the part of the Persians. The confidence that had prompted the march to Issus might also prompt an attack. But the Persian line remained in its place, and Alexander crossed the stream. He had with him his light infantry, not slingers and archers, it should be explained, but regular soldiers, with armour and weapons so modified as to enable them to move quickly, the "Companions," and two divisions of the phalanx. The phalanx was drawn up in companies each sixteen deep. All the soldiers were armed with a pike (_sarissa_), which was twenty-one feet in length. The pikes of the front rank projected fifteen feet, the other end being weighted so that the weapon could be held without difficulty. The pikes of the second rank projected twelve feet, of the third, nine, of the fourth, six, of the fifth, three. The other ranks held their pikes in a slanting direction over the shoulders of those who stood in front. Alexander led the attack, as usual, in person. The Macedonians, moving as quickly as the phalanx could go, fell upon the Asiatic heavy-armed, who occupied the left division of the main Persian line. They were mainly Carduchi, the Kurds of to-day, better hands, it would seem, then as now, at plundering than at fighting. The Carduchi gave way, not waiting for the Macedonians to come to close quarters with them. Their flight endangered the safety of the king, or, rather, the king himself believed that it was endangered. He bade his charioteer turn the horses' heads and fly. As long as the ground allowed he kept to the chariot; when it became too rough he sprang upon a horse, and fled in such haste that he threw away his royal mantle, his bow, and his shield. The mixed multitude that stood behind the main line of Persian battle, as soon as they saw the king quit the field, fled, or, rather, attempted to fly. But, so narrow was the space in which they had been crowded together, they could scarcely move. A scene of frightful terror and confusion followed. The fugitives struggled fiercely with each other in the frantic attempt to escape. Had they shown as much energy in resisting the enemy as in thrusting aside and trampling down their friends, they might have changed the fortune of the day. In less than half an hour from the time when Alexander crossed the Pinarus the left