It was Jarasandha who had challenged Vasudev for a war with him but ultimately he was defeated by Vasudev. However, it was Lord Krishna who had asked Karn to decide on his participation in the war with Jarasandha. Although Karn had decided to fight with Jarasandha but he was just a mere spectator in the war! But why was Karn asked by Lord Krishna to decide on his participation in the war with Jarasandha? What did Lord Krishna wanted to explain to Karn? Want to know more? Find out all here!