Titus Livius (Livy), The History of Rome, Book 33
Evan T. Sage, Ph.D. Professor of Latin and Head of the Department of Classics in the University of Pittsburgh, Ed.

15. Androsthenes, in ignorance of all this, had left Corinth and encamped on the Nemea, which is a stream separating the lands of Corinth and Sicyon. [2] There he ordered half of his army, divided into three columns, and all his cavalry to lay waste at the same time the country of Pellene, Sicyon and Phlius. [3] The three separate columns marched out. When this was reported to Nicostratus at Cleonae, he immediately sent out a strong force of mercenaries to close the pass which gives access to Corinthian territory, [4] and posting the cavalry ahead of the infantry to lead the way, himself followed rapidly in two columns. [5] In one marched the mercenaries with the light infantry, in the other the shield-wearers: these constitute the chief strength in the armies of those states. The infantry and cavalry were now not far from the camp,¹ and some of the [6] Thracians had made an attack upon the enemy, foraging and scattered through the fields, when sudden panic gripped the camp. [7] The commander [p. 317]was afraid, inasmuch as he had nowhere seen the² enemy except in small detachments in the hills in front of Sicyon, not daring to march their column down into the plains, and had never believed that they would attack from Cleonae. [8] He gave orders that the foragers should be recalled by a trumpet-blast and, hastily ordering the troops to arm, he marched out of the gate with his depleted column and formed his battle-line above the river. [9] The rest of the force, assembled and formed with difficulty, did not oppose the enemy's initial charge; the Macedonians had rallied in the largest numbers of all to the standards, and for a long time they rendered the prospect of victory uncertain; [10] at last, exposed by the flight of the rest, with two lines [11] of the enemy advancing from different directions, the light infantry from the flank, the heavy infantry and peltasts from the front, as the hope of victory diminished they at first retired slowly, but then, as the pressure increased, they broke, and most of [12] them threw away their arms, abandoning hope of holding the camp, and made for Corinth. [13] Nicostratus sent the mercenaries to follow them and the cavalry and Thracian auxiliaries against the raiders in the territory around Sicyon, and caused great slaughter there also, greater, almost, than in the battle itself. [14] Part of the troops, too, who had ravaged Pellene and Phlius, returning in disorder and ignorant of what had transpired, when near the camp, drifted into the enemy's outguards in the belief that they were their own, while part of them, suspecting from the confusion what the truth was, scattered in flight [15] in every direction, with the result that as they wandered about they were set upon even by the country-people. The losses that day were fifteen hundred killed, three [p. 319]hundred captured. [16] All Achaea was freed from great³ terror.