first of all sent messages to those in charge of the town, offering them money and promising all kinds of rewards if he were put in possession of the place without fighting.
But being unable to persuade the officers in command, he corrupted some of their subordinates, and relying on their assistance he got his forces ready, intending to deliver the attack on the seaward side with the men of his fleet and on the land side with his army.
He divided his forces into three parts, and after addressing them in terms suitable to the occasion, and promising both the private soldiers and officers great rewards and crowns for valour,
he stationed Zeuxis and his division outside the gate leading to Antioch, Hermogenes was posted near the Dioscurium, and the task of attacking the port and suburb was entrusted to Ardys and Diognetus, since an agreement had been come to with the king's partisans within, that if he could take the suburb by storm, the town would be delivered up to him.
On the signal being given, a vigorous and powerful assault was simultaneously delivered from all sides, but the men under Ardys and Diognetus attacked with the greatest dash,
because, while at the other points an assault by scaling-ladders was altogether out of the question, unless the men could scramble up clinging more or less on all fours to the face of the cliff, yet ladders could safely be brought up and erected against the walls of the port and suburb.
So when the men from the fleet set up their ladders and made a determined attack on the port, and the force under Ardys in like manner assaulted the suburb, and no help could come from the city, as all points were threatened at once, the suburb very soon fell into the hands of Ardys.
Once it was taken, the subordinate officers who had been corrupted rushed to the commander Leontius advising him to come to terms with Antiochus before the town had been stormed.
Leontius, ignorant as he was of the treachery of his officers, but much alarmed by their loss of heart, sent out commissioners to Antiochus to treat for the safety of all in the city.
Walbank Commentary