Defeat of the Persians and Pursuit of Darius. At this juncture, while the Macedonians were doubtful as to the result of the battle, Parmenio sent a messenger to Alexander in haste, to tell him that their side was in a critical position and that he must send him aid.420 When this news was brought to Alexander, he immediately turned back again from the pursuit, and wheeling round with the Companion cavalry, led them with great speed against the right wing of the foreigners. In the first place he assaulted the fleeing cavalry of the enemy, the Parthians, some of the Indians, and the most numerous and the bravest division of the Persians. Then ensued the most obstinately contested cavalry fight in the whole engagement. For being drawn up by squadrons as it were, the foreigners wheeled round and falling on Alexander’s men face to face, they no longer relied 169on the hurling of javelins or the dexterous deploying of horses, as is the common practice in cavalry battles, but every one on his own account strove eagerly to break through what stood in his way, as if this were their only means of safety. They struck and were struck without quarter, as if they were no longer struggling to secure the victory for another, but were contending for their own personal safety. Here about sixty of Alexander’s Companions fell; and Hephaestion himself, as well as Coenus and Menidas, was wounded. But even these troops were overcome by Alexander; and as many of them as could force their way through his ranks fled with all their might. And now Alexander had nearly come into conflict with the enemy’s right wing, but in the meantime the Thessalian cavalry in a splendid struggle, had not fallen short of Alexander’s success in the engagement. For the foreigners on the rig............