Mbh 15.7.1b

Listen, O thou of Kuru's race, as to what those diverge forms are. Verily of various kinds are calamities, O son of Pandu. Thou shouldst always count them, distinguishing their forms, O king, and strive to meet them by applying the well-known ways of conciliation and the rest (without concealing them through idleness). The king should, when equipt with a good force, march (out against a foe), O scorcher of enemies. He should attend also to the considerations of time and place, while preparing to march, as also to the forces he has collected and his own merits (in other respects). That king who is attentive to his own growth and advancement should not march unless equipt with cheerful and healthy warriors. When strong, O son of Pandu, he may march in even an unfavourable season. The king should make a river having quivers for its stones, steeds and cars for its current, and standards for the trees that cover its banks, and which is miry with foot-soldiers and elephants. Even such a river should the king apply for the destruction of his foe. Agreeably to the science known to Usanas, arrays called Sakata, Padma, and Vijra, should be formed, O Bharata, for fighting the enemy.[23] Knowing everything about the enemy's strength through spies, and examining his own strength himself the king should commence war either within his own territories or within those of his foe.[24] The king should always gratify his army, and hurl all his strongest warriors (against the enemy). First ascertaining the state of his kingdom, he should apply conciliation or the other well-known means. By all means, O king, should the body be protected. One should do that which is highly beneficial for one both here and hereafter. The king, O monarch, by behaving duly according to these ways, attains to Heaven hereafter, after ruling his subjects righteously in this world.