 The next year, he sacked the rich port city of Surat in Gujarat.Mirza Raja Jai Singh, who had begun his own military career in the Deccan, was appointed to lead a 14,000 strong army against Shivaji.After winning several forts in Maharashtra from the Maratha king and besieging the fort of Purandar, he managed to force Shivaji to sign the Treaty of Purandar.