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.

10. Philip with a few troopers and infantrymen at first held a hill higher than the rest, so as to watch the fortune of his left flank; [2] later, when he beheld the disorderly flight and saw all the ridges round about filled with the gleam of standards and arms, he too left the field. [3] Quinctius, after pressing hard on the retreating enemy, suddenly, because he saw the Macedonians raising their spears, and not knowing what this meant, halted his troops for a moment because of the strangeness of the action. [4] Then, when he learned that it was the customary gesture of the Macedonians to indicate their surrender, it was in his mind to spare the vanquished. [5] But the soldiers, ignorant that the fighting was over, so far as the enemy was concerned, and not knowing the general's plans, charged, and killing the first put the rest to flight. [6] The king fled at full speed to Tempe. Then he stopped a day at Gonni to collect any who had survived from the battle. The victorious Romans burst into the [p. 303]enemy's camp in the hope of loot, but found that it¹ had, for the most part, already been plundered by the Aetolians. [7] On that day eight thousand of the enemy perished, five thousand were captured. [8] Of the victors about seven hundred fell. If we trust Valerius Antias, who is prone to increase numbers without restraint, forty thousand of the enemy were slain that day; the prisoners, he says —here his exaggeration is more moderate —numbered five thousand seven hundred, and two hundred and forty-nine standards were taken. [9] Claudius too gives the figures as thirty-two thousand killed and four thousand three hundred captured. [10] I have given my account, not because the numbers are smallest, but because I have followed Polybius, an authority worthy of credence on all matters of Roman history and especially on occurrences in Greece.²