Plutarch Demetrius 29

[1] At this time, moreover, bad omens also subdued their spirits. For Demetrius dreamed that Alexander, in brilliant array of armour, asked him what watchword they were going to give for the battle; and when he replied, Zeus and Victory, Alexander said: Then I will go away and join your adversaries; they surely will receive me. ¹

[2] Moreover, Antigonus, when his phalanx was already forming and he was leaving his tent, stumbled and fell prone upon his face, injuring himself severely; but he rose to his feet, and stretching out his hands towards heaven prayed that the gods would grant him victory, or a painless death before his defeat.

[3]
  After the armies had engaged, ² Demetrius, with the largest and best part of the cavalry, clashed with Antiochus, the son of Seleucus; he fought brilliantly and routed his enemy, but by pursuing him too fiercely and eagerly he threw away the victory. For he himself was not able to turn back and rejoin his infantry, since the enemy’s elephants were thrown in his way; and Seleucus, observing that his opponents’ phalanx was unprotected by cavalry, took measures accordingly. He did not actually charge upon them, but kept them in fear of a charge by continually riding around them, thus giving them an opportunity to come over to his side. And this was what actually came to pass.

[4] For a large body of them, detached from the rest, came over to him of their own accord, and the rest were routed. Then, as throngs of his enemies bore down upon him and one of his followers said, They are making at thee, O King, Who else, pray, said Antigonus, should be their mark? But Demetrius will come to my aid.

[5] This was his hope to the last, and to the last he kept watching eagerly for his son; then a whole cloud of javelins were let fly at him and lie fell. The rest of his friends and attendants abandoned him, and one only remained by his dead body, Thorax of Larissa.