The Iliad 10.555–563

Nestor, son of Neleus, great glory of the Achaeans, easily might a god that willed it bestow even better horses than these, for the gods are mightier far. But these horses, old sir, whereof thou askest, are newly come from Thrace, and their lord did brave Diomedesslay, and beside him twelve of his comrades, all them that were the best. And for the thirteenth we slew a scout near the ships, one that Hector and the other lordly Trojans had sent forth to spy upon our camp. So spake he, and drave the single-hooved horses through the trench, slay, and beside him twelve of his comrades, all them that were the best. And for the thirteenth we slew a scout near the ships, one that Hector and the other lordly Trojans had sent forth to spy upon our camp.