The Mughal General, who decisively defeated Shivaji and forced him to conclude the Treaty of Purandar, was

Shivaji was forced to sign the agreement after Jai Singh besieged Purandar fort. When Shivaji realised that war with the Mughal Empire would only cause damage to the empire and that his men would suffer heavy losses, he chose to make a treaty instead of leaving his men under the Mughals.