Mbh 6.113.1a

Sanjaya said, “The heroic Drona, that great bowman endued with the prowess of an infuriate elephant, that foremost of men possessed of great might, taking up his large bow which was capable [of] checking even an infuriate elephant, and shaking it (in his hands), was engaged in afflicting the Pandava ranks, having penetrated into their midst. That valiant warrior acquainted with every omen, beholding the omens on all sides, addressed his son who also was scorching the hostile ranks and said these words, ‘This is that day, O son, on which the mighty Partha, desirous of slaying Bhishma in battle, will exert himself to the best of his might. My arrows are coming out (of the quiver, of their own accord). My bow seems to yawn. My weapon seems unwilling to obey my behests, and my heart also is cheerless. Animals and birds are uttering fearful and incessant cries. Vultures seem to disappear beneath the feet of the Bharata troops. The Sun himself seems to have lost hue. The quarters are all ablaze. The Earth seems to shriek, inspire fear, and tremble everywhere. Kankas, and vultures, and cranes are frequently crying. Jackals are uttering inauspicious and fierce yells foreboding great danger. Large meteors seem to fall from the centre of the solar disc. The constellation called Parigha, with a trunkless form, appeareth around the Sun. The solar and the lunar discs have become awful, foreboding great danger to Kshatriyas about the mangling of their bodies. The idols of the Kuru king in his temples tremble and laugh and dance and weep. The illustrious Moon riseth with his horns downward. The bodies of the kings belonging to the Kuru army all seem to be pale, and though clad in mail, are shorn of splendour. The loud blare of Panchajanya and the twang of Gandiva are heard on all sides of both the armies. Without doubt, Arjuna, relying upon his great weapons and avoiding other warriors will advance upon the grandsire.