Mbh 6.3.7a

“Vyasa said,--‘The (sacred) fire assumes a cheerful radiance. Its light ascends upwards. Its flame bends towards the right. It blazes up without being smoky. The libations poured on it yield a fragrant scent. It is said that these are the indications of future success. The conches and cymbals yield sounds that are deep and loud. The Sun as well as the Moon gives pure rays. It is said that these are the indications of future success. Crows, whether stationary or on their wings, utter cries that are agreeable. They again that are behind, urge the warriors to advance; while they that are ahead, forbid all advance.[28] Where vultures, swans, parrots, cranes, and wood-peckers utter delightful cries, and wheel towards the right, the Brahmanas say that their victory in battle is certain. They whose divisions, in consequence of ornaments, coats of mail, and standards, or the melodious neigh of their steeds, become resplendent and incapable of being gazed at, always conquer their foes. They who utter cheerful shouts, those warriors, O Bharata, whose energies are not damped and whose garlands do not fade, always cross the ocean of battle. They who utter cheerful shouts having penetrated into the divisions of the foe, who utter even kind words,[29] to the enemy, and who, before striking, forewarn the foe, win victory. The objects of hearing, vision, taste, touch, and smell, without undergoing any change for the worse, become auspicious. This also is another indication of a victorious army, viz., there is joy among the combatants at all time. This also is another indication of success, viz. the winds that blow, the clouds, and the birds, all become favourable; while the clouds (so favourable) and the rain-bows drop beneficial showers. These, O king, are the indications of armies to be crowned with victory, while O monarch, all these become otherwise in the case of those that are about to be destroyed.