Soon after he led an expedition against the usurper Vanbir & after a hotly contested engagement between the two forces Vanbir fled from the battlefield. When the news of him being alive reached the people, they acknowledged him as the rightful heir of Mewar. In reality, Udai Singh had been rescued to Kumbhalgarh & was kept in concealment for a year disguised as a nephew of the governor Asha Shah Depura (Maheshwari). Vanbir assumed the sleeping boy to be Udai Singh and killed him.

But before he arrived at the palace to kill him, the prince had been removed safely from there by the daring action of his nurse Panna who sacrificed her own son Chandan in order to save his life from his Uncle. He was an illegitimate son to Prithviraj and tried to get rid of the heir designate Udai Singh who enjoyed the esteem of the nobility. Ratan's half-brother Vikramaditya was murdered by the nobles who supported Vanbir’s claim to the throne & Vanbir usurped the throne of Chittorgarh in 1536 A.D. During his reign, when the Turkic Sultan of Gujarat Bahadur Shah sacked Chittor in 1534, Udai Singh was sent to Bundi for safety. He was succeeded by his half-brother Maharana Vikramaditya Singh. After the death of his father, Maharana Sangram Singh, he was succeeded by his eldest surviving son, Maharana Ratan Singh. He was born in Chittorgarh in 1522 & was the fourth son of Maharana Sanga & Rani Karnavati. Udai Singh II was the Maharana of Mewar, in the present-day Rajasthan state of India.

Maharana pratap singh and padmavati