The Santhal Revolt of 1855-56 was led by Sidhu and Kanhu Manjhi, who were brothers from the Santhal tribe. The revolt was a response to the oppressive practices of the British and local landlords. Sidhu Manjhi, in particular, played a key role in organizing and leading the revolt, which aimed at securing the rights of the Santhal tribe and challenging the British control over land and resources. The revolt eventually led to the formation of the Santhal Parganas, which is named after the Santhal tribe.
While Birsa Munda was a prominent leader in a later revolt (the Munda Rebellion), Sidhu Manjhi is the correct leader for the Santhal Revolt of 1855-56.