 In 1256 AD after a couple months the Meymoon-Dej (Meymoon-Diž, ) fort surrendered to Hulaku’s army, and Imam Rukn ad-Din Khurshah was captured.Hulaku Khan asked Khurshah to order his followers to surrender, but Lambsar fort, Gerdkuh fort and Alamut fort did not follow the order.Finally after a year of resisting, a cholera epidemic took many lives in Lambsar and the fort fell in January 1257.