Krishna was worried. He realised that the Yadavas would become weakened from their war with Kalayavana. And if Jarasandha’s attack came after that, the Yadavas might even lose at the hands of Jarasandha. On the other hand if the Yadavas became weak from a war with Jarasandha, they might lose the war with Kalayana. There was danger from both sides. It was, therefore, necessary to build a strong fort from where the Yadavas could wage along drawn out war, even in the absence of Krishna. On the shores of the ocean Krishna, therefore, built the city of Dvaraka. There were many gardens and lakes in Dvaraka. But some importantly, it was surrounded by walls and moats on all sides and there were several forts inside the city. All the citizens of Mathura were brought to Dvaraka.

Krishna then appeared before Kalayavana. At the sight of Krishna, Kalayavana began to follow him, desirous of a fight. Krishna had a plan. He went inside a cave where a powerful king known as Muchukunda was sleeping. Kalayavana followed Krishna inside the cave. It was dark inside so that Kalayavana could not make out that the person who was sleeping was Muchukunda and not Krishna. So thinking that it was Krishna, Kalayavana kicked the body. When the king woke up, the anger in him came out as fire through his eye and this fire burnt up Kalayavana into ashes.