So Dhṛtarāṣṭra constructed a house of lac. Lac means as soon as you touch one match stick, immediately takes fire. So he asked his nephews and sister-in-law, Kuntī, that "For sometimes you go. I have constructed a very nice house. You can go and live there." Vidura informed that "This is the policy: Dhṛtarāṣṭra wants you to burn into ashes by going that house." Duryodhana could understand that Vidura had already informed. Therefore he was very angry. These are politics. So although they knew that "This is the plan of my uncle to send into that house and set fire," but they agreed, "Yes," not disobedient to the order of the superior. In this way the house was set into fire, but they digged a subway within that house, and they escaped.
So that is one incidence. Another incidence is giving them poison cakes when they were at home. That also they escaped. Then puruṣāda-darśanāt. They met one Hiḍimba Rākṣasa, man-eater demon. So Bhīma fought with him and killed him.