Mbh 7.92.1d

And many, exceedingly frightened, trod down and crushed their own men. And many which were kept as reserves and which were fierce as snakes of virulent poison, did the same. And many terrible Yavanas and Paradas and Sakas and Valhikas, and Mlecchas born of the cow (belonging to Vasishtha), of fierce eyes, accomplished in smiting looking like messengers of Death, and all conversant with the deceptive powers of the Asuras and many Darvabhisaras and Daradas and Pundras numbering by thousands, of bands, and together forming a force that was countless, began to shower their sharp shafts upon the son of Pandu. Accomplished in various modes of warfare, those Mlecchas covered Arjuna with their arrows. Upon them, Dhananjaya also quickly poured his arrows. And those arrows, shot from Gandiva, looked like flights of locusts, as they coursed through the welkin. Indeed, Dhananjaya, having by his arrows caused a shade over the troops like that of the clouds, slew, by the force of his weapons, all the Mlecchas, with heads completely shaved or half-shaved or covered with matted locks, impure in habits, and of crooked faces. Those dwellers of hills, pierced with arrows, those denizens of mountain-caves, fled away in fear. And ravens and Kankas and wolves, with great glee, drank the blood of those elephants and steeds and their Mleccha-riders overthrown on the field by Partha with his sharp shafts. Indeed, Arjuna caused a fierce river to flow there whose current consisted of blood. (Slain) foot-soldiers and steeds and cars and elephants constituted its embankments. The showers of shafts poured constituted its rafts and the hairs of the combatants formed its moss and weeds. And the fingers cut off from the arms of warriors, formed its little fishes. And that river was as awful as Death itself at the end of the Yuga. And that river of blood flowed towards the region of Yama, and the bodies of slain elephants floating on it, obstructed its current.