Plutarch Demetrius 49

[1] When Seleucus made his appearance there and encamped near by, Demetrius set his army in motion by night and advanced against him. Seleucus was ignorant of his approach for a long time, and lay sleeping. But when some deserters came and told him of his peril, he was astounded, and leaping up ordered the trumpets to be sounded, at the same time pulling on his boots and shouting to his companions that a terrible wild beast was upon them. But Demetrius, perceiving from the noise which his enemies made that they had been informed of his approach, drew off his troops with all speed.

[2] When day came, however, Seleucus was pressing him hard, so he sent one of his officers to the other wing, and partially routed the enemy. But at this point Seleucus himself, quitting his horse, doffing his helmet, and taking a light shield, went to meet the mercenaries of Demetrius, showing them who he was, and exhorting them to come over to him, since they must for some time have been aware that his long forbearance had them in view, and not Demetrius.

[3] Consequently they all welcomed him, hailed him as king, and went over to him.
  Then Demetrius, perceiving that the last of many reversals of fortune was now come upon him, left the field and fled to the passes of Amanus, where he plunged into a dense forest along with sundry friends and followers, few all told, and waited for the night. He wished, if possible, to take the road to Caunus and make his way through to the sea, where he expected to find his fleet.

[4] But when he learned that the party had not provisions enough even for the coming day, he tried to think of other plans. At this point, however, Sosigenes came up, a companion of his, with four hundred pieces of gold in his belt; so hoping that with this money they could make their way through to the sea, the party set out towards the passes, in the darkness of night. In the passes, however, the enemy were burning fires, so the fugitives despaired of this road and once more returned to their place in the forest-not all of them, for some had run away; nor was the remnant as willing as before.

[5] And when one of them ventured to speak out boldly and say that Demetrius ought to surrender himself to Seleucus, Demetrius drew his sword and would have killed himself; but his friends encompassed him, and with encouraging words persuaded him to do as the man had said. So he sent to Seleucus and put himself at his disposal.