Sur Empire
In 1544 Sher Shah Suri invaded Marwar after defeating Maldev at Sammel. Udai Singh had just dealt with the civil war in Mewar and did not have the resources to fight the Sur Empire, he thus surrendered Chittor to Sher Shah Suri on the terms that Sher Shah does not harm the people of Mewar. Sher Shah also accepted the terms as he knew that the siege would be long and costly.