Plutarch, Aemilius Paulus
Bernadotte Perrin, Ed.

21. But the struggle between them was fierce. Here, too, Marcus, the son of Cato and the son-in-law of Aemilius, while displaying all possible prowess, lost his sword. Since he was a young man of the most generous education and owed to a great father proofs of great valour, he thought life not worth the living if he abandoned such spoil of his own person to the enemy, and ran along the ranks telling every friend and companion whom he saw of his mishap and begging them for aid. [2] These made a goodly number of brave men, and making their way with one impulse through the rest, they put themselves under his lead and fell upon the enemy. With a great struggle, much slaughter, and many wounds, they drove them from the ground, and when they had won a free and empty place, they set themselves to looking for the sword. And when at last it was found hidden among great heaps of armour and fallen bodies, they were filled with exceeding joy, and raising songs of triumph fell yet more impetuously upon those of the enemy who still held together. [3] Finally, the three thousand picked men of the Macedonians, who remained in order and kept on fighting, were all cut to pieces; and of the rest, who took to flight, the slaughter was great, so that the plain and the lower slopes of the hills were covered with dead bodies, and the waters of the river Leucus were still mingled with blood when the Romans crossed it on the day after the battle. For it is said that over twenty-five thousand of their enemies were slain; while of the Romans there fell, according to Poseidonius, a hundred, according to Nasica, eighty.