BOOK V. 59. 1-60. 15

In consequence of this decision [to lay siege to Seleucia Pieria], orders were sent to Diognetus the commander of the fleet to sail towards Seleucia: while Antiochus himself started from Apameia with his army, and encamped near the Hippodrome, about five stades from the town. He also despatched Theodotus Hemiolius with an adequate force against Coele-Syria, with orders to occupy the passes and to keep the road open for him.

The situation of Seleucia and the natural features of the surrounding country are of this kind. The city stands on the sea coast between Cilicia and Phoenicia; and has close to it a very great mountain called Coryphaeus, which on the west is washed by the last waves of the sea which lies between Cyprus and Phoenicia; while its eastern slopes overlook the territories of Antioch and Seleucia. It is on the southern skirt of this mountain that the town of Seleucia lies, separated from it by a deep and difficult ravine. The town extends down to the sea in a straggling line broken by irregularities of the soil, and is surrounded on most parts by cliffs and precipitous rocks. On the side facing the sea, where the ground is level, stand the market-places, and the lower town strongly walled. Similarly the whole of the main town has been fortified by walls of a costly construction, and splendidly decorated with temples and other elaborate buildings. There is only one approach to it on the seaward side, which is an artificial ascent cut in the form of a stair, interrupted by frequently occurring drops and awkward places. Not far from the town is the mouth of the river Orontes, which rises in the district of Libanus and Anti-Libanus, and after traversing the plain of Amyca reaches Antioch; through which it flows, and carrying off by the force of its current all the sewage of that town, finally discharges itself into this sea not far from Seleucia.

[60] Antiochus first tried sending messages to the magistrates of Seleucia, offering money and other rewards on condition of having the city surrendered without fighting. And though he failed to persuade the chief authorities, he corrupted some of the subordinate commanders; and relying on them, he made preparations to assault the town on the sea-ward side with the men of his fleet, and on the land side with his soldiers. He divided his forces therefore into three parts, and addressed suitable words of exhortation to them, causing a herald to proclaim a promise to men and officers alike of great gifts and crowns that should be bestowed for gallantry in action. To the division under Zeuxis he entrusted the attack upon the gate leading to Antioch; to Hermogenes that upon the walls near the temple of Castor and Pollux; and to Ardys and Diognetus the assault upon the docks and the lower town: in accordance with his understanding with his partisans in the town, whereby it had been agreed that, if he should carry the lower town by assault, the city also should then be put into his hands. (...)

More....

Polybius, Histories, Book V, translated from the Greek by Evelyn S. Shuckburgh, In parentheses Publications, Greek Series, Cambridge, Ontario, 2002.