Mbh 7.107.2b

And soon again, he entered into the bowels of the earth and once more becoming little he suddenly soared into the sky. Alamvusha assumed countless forms. Now becoming subtle and now huge and gross, he began to roar like the clouds. And he uttered diverse kinds of words and speeches all around. And from the welkin there fell thousands of arrowy torrents, as also darts, and Kunapas, and lances, and spiked maces, and short arrows, and scimitars, and swords, and thunders also. That awful downpour of arrows caused by the Rakshasa, slew the troops of Pandu’s son on the field of battle. And in consequence of that arrowy downpour, many elephants also of the Pandava army were slain, and many steeds also, O king, and many foot-soldiers. And a river was caused there, whose waters were blood and whose eddies were constituted by cars. And it abounded with elephants that constituted its alligators. And the umbrellas of car-warriors constituted its swans, and the flesh and marrow of animals, its mire. And it teemed with the (cut off) arms of human beings that constituted its snakes. And it was haunted by many Rakshasas and other cannibals. And it wafted away, O king, countless Chedis and Panchalas and Srinjayas. Beholding him, O monarch, careering so fearlessly in that battle and seeing his prowess, the Pandavas became filled with anxiety; and joy filled the hearts of thy troops then. And amongst the latter, loud and terrible sounds of musical instruments, making the hair stand on end, arose. Hearing that loud uproar made by thy troops, the son of Pandu could not bear it, as a snake cannot bear the clap of human palms. With eyes red as copper in rage, with glances that like fire consumed every thing, the son of the Wind-god, like Tvashtri himself, aimed the weapon known by the name of Tvashtri. From that weapon were produced thousands of arrows on all sides. And in consequence of those arrows, a universal rout was seen among thy troops.