Mbh 6.1.4

Vaisampayana said,--“Listen thou, O lord of the earth, how those heroes,--the Kurus, the Pandavas, and the Somakas,--fought on the sacred plain of the Kurukshetra.[1] Entering Kurukshetra, the Pandavas endued with great might, along with the Somakas, advanced, desirous of victory, against the Kauravas. Accomplished in the study of the Vedas, all (of them) took great delight in battle. Expectant of success in battle, with their troops (they) faced the fight. Approaching the army of Dhritarashtra’s son, those (warriors) invincible in battle[2] stationed themselves with their troops on the western part (of the plain), their faces turned towards the east. Yudhishthira, the son of Kunti, caused tents by thousands to be set up according to rule, beyond the region called Samantapanchaka. The whole earth seemed then to be empty, divested of horses and men, destitute of cars and elephants, and with only the children and the old left (at home). From the whole area of Jamvudwipa over which the sun sheds his rays,[3] was collected that force, O best of kings. Men of all races,[4] assembled together, occupied an area extending for many Yojanas over districts, rivers, hills, and woods. That bull among men, king Yudhishthira, ordered excellent food and other articles of enjoyment for all of them along with their animals. And Yudhishthira fixed diverse watch-words for them; so that one saying this should be known as belonging to the Pandavas. And that descendant of Kuru’s race also settled names and badges for all of them for recognition during time of battle.