As we know that Kansa invited Krishna and Balram through Akrur to participate in the Bow-yajna after he had lost all the demons in his service and other warriors one by one at Krishna's hands. He wanted to kill Krishna through a trick. Akrur proceeded to Mathura after seating Krishna and Balram in his chariot. Reaching the bank of the Yamuna Akrur stopped the chariot. Seeking the consent of both the brothers, he went to have his bath in the river. When Akrur dipped in the river-water, he saw Krishna and Balram inside the water. But when he drew his head out of the water, he found both the brothers sitting in the chariot. He felt highly amazed indeed. Now Akrur had a second dip and saw Lord Vishnu relaxing on the body of Sheshnaga. He found a close semblance in the faces of Krishna and Vishnu. Akrur felt flattered to have a glimpse of Lord Vishnu in the river-water. Having had his bath, he said his prayers and returned to the chariot. Time and again, he was looking at Krishna with eyes full of devotion. He was thanking his stars to be lucky enough to act as the charioteer of Krishna (Lord Vishnu Himself).
Krishna made up his mind to go to the site of the Bow-yajna. So, they Enquirer about this site from the people and soon advanced in that direction. Reaching the site of the yajna, Krishna and Balram looked at the bow that was very heavy--so much so that even Kansa could lift it with difficulty after worshipping it daily. He had put brave soldiers to guard the bow. Krishna and Balram, despite the presence of the soldiers, went near the bow. Krishna at once lifted it and pulled its string with such a force that it broke into two with a loud twang. Seeing this, the soldiers fell upon both the brothers who beat them with the pieces of the bow. So they went running to their master Kansa and told him about what had happened. Kansa got furious and he dispatched a regiment of armed soldiers to deal with Krishna and Balram who eliminated the entire regiment in no time. Now Krishna and Balram returned to Nand Baba's camp and related to him the entire incident. Then having had their bath, they took their meals and went t~ sleep. Kansa was cut to the quick over the lot of his regiment.