Titus Livius (Livy), The History of Rome, Book 31
Cyrus Evans, Ed.

27. The consul, Sulpicius, who was at that time encamped on the river Apsus, between Apollonia and Dyrrachium, having ordered Lucius Apustius, lieutenant-general, thither, sent him with part of the forces to lay waste the enemy's territory. [2] Apustius, after ravaging the frontiers of Macedonia, and having, at the first assault, taken the forts of Corragos, Gerrunios, and Orgessos, came to Antipatria, a city situated in a narrow gorge; [3] where, at first inviting the leading men to a conference, he endeavoured to entice them to commit themselves to the good faith of the Romans; but finding that from confidence in the size, fortifications, and situation of their city, they paid no regard to his discourse, he attacked the place by force of arms, and took it by assault: [4] then, putting all the young men to death, and giving up the entire spoil to his soldiers, he razed the walls and burned the city. [5] This proceeding spread such terror, that Codrion, a strong and well-fortified town, surrendered to the Romans without a struggle. [6] Leaving a garrison there, he took Ilion by force, a name better known than the town, on account of that of the same name in Asia. As the lieutenant-general was returning to the consul with a great quantity of spoil, Athenagoras, one of the king's generals, falling on his extreme rear, in its passage over a river, threw the hindmost into disorder. [7] On hearing the shouting and tumult, Apustius rode back in full speed, ordered the troops to face about, and drew them up in order, arranging the baggage in the centre. The king's troops could not support the onset of the Roman soldiers, many of them were slain, and more made prisoners. [8] The lieutenant-general, having brought back the army without loss to the consul, was despatched immediately to the fleet.