Fa Zheng
After listening to the advice from Zhang Song, Liu Zhang sent Fa Zheng with 4000 men to form an alliance with Liu Bei and presented him with many expensive gifts. Zhang Song and Fa Zheng privately disapproved of Liu Zhang's governance and looked at Liu Bei as a solution for a legitimate successor. When Liu Bei met them, he welcomed them warmly and treated them with kindness. He used this opportunity to lear more about Yi province mostly the weaponry, stores and number of horses as well as other strategic locations and their distance to each other. Zhang Song and his entourage told him about everything and furthmore drew a map of Yi province with the location of the mountains and rivers. With their help, Liu Bei learned all about Yi province. Liu Zhang invited Liu Bei to join him in Yi Province to capture Hanzhong Commandery before Cao Cao did.