Zhang Song (died January or February 212), courtesy name Ziqiao, was an official and adviser serving under the warlord Liu Zhang during the late Eastern Han dynasty of China. Life Zhang Song was from Shu Commandery (蜀郡), which is located within present-day Chengdu, Sichuan. Later, he started his career as an adviser to Liu Zhang, the Governor of Yi Province during the Eastern Han dynasty. His appointment was Aide-de-camp (別駕從事). During the late 208, Zhang Song's received his first mission when Liu Zhang sends him after his brother Zhang Su (張肅) as an emissary to Cao Cao. At this time, Cao Cao already had conquered the majority of Jing Province and driven off Liu Bei at the battle of Changban and so didn't employ Zhang Song which greatly angered him. The Han Jin Chunqiu (漢晉春秋) add some precision, that when they met, Cao Cao was condescend with Zhang Song and didn't show any interest in him. Because of this attitude, when he returned Zhang Song advised Liu Zhang to cut his relation with Cao Cao. Following this, Cao Cao lost the battle of Chibi and many of his men died from disease. When Zhang Song returned, he harshly criticized Cao Cao and advised Liu Zhang to sever his relation with Cao Cao unilaterally. However, he encouraged him to establish friendly relation with Liu Bei advocating that they were from the same clan. Liu Zhang agreed to his proposal and had Fa Zheng sent to begin talks with Liu Bei. Not long after, along with Meng Da. Fa Zheng was ordered to lead several thousand soldiers to help Liu Bei in his defence of Jing. Fa Zheng afterwards was called back. Around 211, when Liu Zhang received news that Cao Cao, the warlord who controlled the Han central government and the figurehead Emperor Xian, was planning to attack Zhang Lu, another warlord in the neighbouring Hanzhong Commandery, he became fearful that Cao Cao would attack Yi Province after defeating Zhang Lu. During this time, Zhang Song advised Liu Zhang to invite Liu Bei to lead his troops into Yi Province and help Liu Zhang deal with Zhang Lu. Zhang Song told him: "Cao Cao's armies are strong and without a match in the empire. If he was able to use Zhang Lu's grain stores and launch an invasion of Yi province, who could stop him." Liu Zhang answered that he was