The gods wanted to tear it up and use it as a churning rod but failing to do so came to Vishnu and Brahman who were sitting together, and said unto them, ‘Devise some efficient scheme, consider, ye gods, how Mandara may be dislodged for our good.’

In plain words: The gods wanted to pull up Mount Mandara to use as a churning stick, but they could not. So they went to Vishnu and Brahma and asked them to come up with a plan to move it.