This Siege was done by Bahadur Shah of Gujarat, who in March 1535 attacked Chittor Fort to expand his empire. Rani Karmavati, wife of the late Rana Sanga sent a rakhi to Humayun for help. Bahadur Shah appealed to Humayun to let him sack chittor saying that, "If I at this time oppose him, I would be rendering assistance to the infidel, and such a proceeding is not in accordance with the law of the prophet and religion, therefore there must be a delay until this matter is disposed of" .Either Humayun slacked off or arrived late because by the time he arrived on 8th March 1535, 13,000 women including Rani Karnavati committed Jauhar and 3,200 soldiers committed Saka. Rana Vikramaditya, Udai Singh and Udai Singh's faithful nurse Panna Dai escaped to Bundi. Humayun later drove Bahadur Shah out of Chittor.
The Mewari army had more than 3,200 soldiers.