What is virata parvam in mahabharata?

Virata Parva is the fourth book of the Hindu epic Mahabharata. It primarily deals with the one year period of the Pandavas' exile in incognito (Agyatavasa) spent in the court of King Virata. The Pandavas disguised themselves during this time, Arjuna as a eunuch, Bhima as a cook, Nakula and Sahadeva as horse and cattle attendants respectively, and Draupadi as a maid. The book has 72 chapters and describes the events that occurred during this period, including battles between the Kauravas and the Virata kingdom, and the revelation of the true identities of the Pandavas to King Virata. The Virata Parva also features the story of the education of Uttarā, Prince of the Virata Kingdom, by Arjuna in the art of warfare. The book concludes with the Kauravas declaring war against the Pandavas after the end of the Pandavas' term of Agyatavasa.