During his stay in the Netherland, many sons were born to Lord Vishnu, who were very wicked and cruel. These sons of lord Vishnu started tormenting the inhabitants of all the three world. All the deities and the sages went to lord Shiva to take his help. They requested him to kill the cruel sons of Vishnu and reestablish him (lord Vishnu) in his own abode, which he had abandoned for the Nether world.
Lord Shiva went to the Netherworld in the form of an Ox (Vrishabh). He killed all the sons of lord Vishnu with his sharp horns. Seeing the death of his sons, lord Vishnu came forward to fight him. He attacked lord Shiva with his various weapons, but lord Shiva remained harmless. Ultimately lord Vishnu was able to recognise him. He eulogized lord Shiva.
Lord Shiva then requested him to return back to Vishnuloka, he accepted. Lord Vishnu left his
‘Sudarshan chakra’ in the Netherworld and went to his own abode, where lord Shiva presented him a new Sudarshan chakra.