Yudhishthir's being the crown prince and his rising popularity with the citizens was extremely distasteful to Duryodhan, who saw himself as the rightful heir since his father was the de facto king. He plotted to get rid of the Pandavas. This he did by getting his father to send the Pandavas and Kunti off to a nearby town on the pretext of a fair that was held there. The palace in which the Pandavas were to stay in that town was built by an agent of Duryodhan; the palace was made entirely of inflammable materials since the plan was to burn down the palace - together with the Pandavas and Kunti - once they'd settled in. The Pandavas, however, were alerted to this fact by their other uncle, Vidur, and had a counter plan ready; they dug an escape tunnel underneath their chambers. One night, the Pandavas gave out a huge feast which all of the townsfolk came to. At that feast, a forest woman and her five sons found themselves so well-fed and well-drunk that they could no longer walk straight; they passed out on the floor of the hall. That very night, the Pandavas themselves set fire to the palace and escaped through the tunnel. When the flames had died down, the townsfolk discovered the bones of the forest woman and her boys, and mistook them for Kunti and the Pandavas. Duryodhan thought his plan had succeeded and that the world was free of the Pandavas.
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