Mahabharata Drona Parva Chapter 162:3

Mahabharata Drona Parva (Ghatotkacha-badha Parva) Chapter 162:3 On each elephant, they placed seven lamps; on each car, ten; and on the back of each steed they placed two lamps; and on the flanks and rear (of their cars) and on their standard also, they placed many lamps. And on the flanks of their host, and on the rear and the van, and all around and within, many other lamps were lighted. The Kurus having done the same, both the armies were thus lighted. Throughout the host, the foot-soldiers became mingled with elephants and cars and cavalry. And the army of Pandu's son was also illuminated by others (than foot-soldiers) standing with blazing torches in their hands. With those lamps that host became fiercely effulgent, like a blazing fire made doubly resplendent by the dazzling rays of the maker of day. The splendour of both the armies, over-spreading the earth, the welkin, and all the points of the compass, seemed to increase. With that light, thy army as also theirs became distinctly visible. Awakened by that light which reached the skies, the gods, the Gandharvas, the Yakshas, the Rishis and other crowned with (ascetic) success, and the Apsaras, all came there. Crowded then with gods and Gandharvas, and Yakshas, and Rishis crowned with (ascetic) success, and Apsaras, and the spirits of slain warriors about to enter the celestial regions, the field of battle looked like a second heaven. Teeming with cars and steeds and elephants, brilliantly illumined with lamps, with angry combatants and horses slain or wandering wildly, that vast force of arrayed warriors and steeds and elephants looked like the arrays of the celestials and the Asuras in days of old. The rush of darts formed the fierce winds; great cars, the cloud; the neigh and grunt of steeds and elephants, the roars; shafts, the showers; and the blood of warriors and animals, the flood, of that tempest like nocturnal encounter between those god-like men. In the midst of that battle, that foremost of Brahmanas, viz., the high-souled Aswatthaman, scorching the Pandavas, O ruler of men, resembled the midday sun at the end of the season of rains, scorching everything with his fierce ray.