When Paandav had completed their term of exile of 13 years, they sent Krishn as a Peace Messenger (Shaanti Doot) to Dhritraashtra, but he himself was unable to take any decision because of his son's love. And his son never wanted to give land to Paanadav even equal to the tip of a needle. So the war was the only solution. So in the end Mahaabhaarat war broke. 

This war lasted for 18 days. All great warriors from Duryodhan side were killed in this war. Since Dhritraashtra was blind, Ved Vyaas gave Sanjay (his Saarathee) the divine sight to see the battlefield sitting in the palace, and tell him its account. All people including Duryodhan were killed. Gaandhaaree tried her best to save her son but at that time also he did not listen to her. 

Everybody knew that Bheem vowed to break the thigh of Duryodhan, and so he did and killed him. He even killed Dushaasan also and brought his chest's blood for Draupadee. When the war was over and Paandav came to greet their great parents, Dhritraashtra's heart was filled with poison towards Bheem because he killed his eldest son. Krishn knew this, so He had already made a life-size brass statue of Bheem. Because he also knew that Dhritraashtra would not be satisfied only by touching feet by all other Paandav, but he would like to embrace Bheem. And at that time he would have so much strength in his body that even brass statue could be broken. 

Wnen Paandav, Krishn and Vidur  came to see Dhritraashtra and Gaandhaaree, all Paandav touched Dhritraashtra's feet introducing themselves and he blessed them. Krishn presented Bheem in the last. Dhritraashtra was getting restless to embrace him so he asked "Where is Bheem?" And then Bheem touched his feet and moved at one side. Dhritraashtra came forward saying "I want to embrace you" and spread his arms. Immediately Krishn gave the brass statue in his arms. He pressed the statue so hard that it really cracked inside his arms and thus Bheem was saved. Everybody was greatly surprised to see this, but this was the truth. Then Dhritraashtra got very sad after crushing Bheem to death "Oh, I have killed my dear brother's son." Then Bheem again came forward and greeted him and said, "Great father, I am here." Then he embraced him properly.

Thus Dhritraashtra neither got the kingdom nor the peace of mind. Later Yudhishthir requested both of them to live with them only in the palace. He daily used to go to greet him in the morning before going to royal court. 

In the last after living with Yudhishthir for some time, on Vidur's advice, one fine morning he went to forest with Gaandhaaree without telling anybody. When Yudhishthir went to him to greet him, he didn't find them he repented for his mistakes whatever he committed. But Vidur Jee said - "It is not because of you, but now his time has come. On 7th day from today he will got to Swarg and Gaandhaaree will also follow him."