Titus Livius (Livy), The History of Rome, Book 36
Cyrus Evans, Ed.

10. Having accomplished all this within the space of ten days after his arrival at Pherae, he marched with his whole force to Cranon, which he took immediately on his arrival. [2] He then took Cypaera and Metropolis, and the forts which lay around them; and now every town in all that tract was in his power, except Atrax and Gyrton. [3] He next resolved to lay siege to Larissa, for he thought that (either through dread inspired by the storming of the other towns, or in consideration of his kindness in dismissing the troops of their garrison, or being led by the example of so many cities surrendering themselves) they would not continue longer in their obstinacy. [4] Having ordered the elephants to advance in front of the battalions, for the purpose of striking terror, he approached the city with his army in order of battle, on which the minds of a great number of the Larissans became irresolute and perplexed, between their fears of the enemy at their gates, and their respect for their distant allies. [5] Meantime, Amynander, with the Athamanian troops, seized on Pellinaeus; while Menippus, with three thousand Aetolian foot and two hundred horse, marched into Perrhaebia, where he took Mallaea and Cyretiae by assault, and ravaged the lands of Tripolis. [6] After executing these enterprises with despatch, they returned to the king at Larissa just when he was holding a council on the method of proceeding with regard to that place. [7] On this occasion there were opposite opinions: for some thought that force should be applied; that there was no time to be lost, but that the walls should be immediately attacked with works and machines on all sides at once; especially as the city stood in a plain, the entrances open, and the approaches every where level. [8] While others represented at one time the strength of the city, greater beyond comparison than that of Pherae; [9] at another, the approach of the winter season, unfit for any operation of war, much more so for besieging and assaulting cities. [10] While the king's judgment was in suspense between hope and fear, his courage was raised by ambassadors happening to arrive just at the time [p. 1619]from Pharsalus, to make surrender of their city. In the mean time Marcus Baebius had a meeting with Philip in Dassaretia; and, in conformity to their joint opinion, sent Appius Claudius to reinforce Larissa, who, making long marches through Macedonia, arrived at that summit of the mountains which overhang Gonni. [11] The town of Gonni is twenty miles distant from Larissa, standing at the opening of the valley called Tempe. Here, by laying out his camp more widely than his numbers required, and kindling more fires than were necessary, he imposed on the enemy the opinion which he wished, that the whole Roman army was there, and king Philip along with them. [12] Antiochus, therefore, pretending the near approach of winter as his motive, staid but one day longer, then withdrew from Larissa, and returned to Demetrias. The Aetolians and Athamanians retired to their respective countries. Appius, although he saw that, by the siege being raised, the purpose of his commission was fulfilled, yet resolved to go down to Larissa, to strengthen the resolution of the allies against future contingencies. [13] Thus the Larissans enjoyed a twofold happiness, both because the enemy had departed from their country, [14??] and because they saw a Roman garrison within their city.