What was the main cause of the failure of the revolt of 1857?

Which of these was not a reason of failure of 1857 revolt?

The revolt of 1857 at Lucknow was led by :

The Revolt of 1857 was witnessed by the poet –

Who was the last Mughal emperor at the time of the Revolt of 1857?

Who called the revolt of 1857 a conspiracy?