In 279, Emperor Wu wanted to launch a major invasion against Eastern Wu, the last of the Three Kingdoms, as part of his grand plan to reunify China under the Jin dynasty. Jia Chong opposed the emperor's idea and argued that Wu was too difficult to conquer. Emperor Wu not only ignored his advice, but also appointed him as the coordinator of a six-pronged attack on Wu. When Jia Chong declined, Emperor Wu told him to coordinate anyway, or else the emperor himself would personally coordinate. Jia Chong relented, but continued to oppose military action. In early 280, despite some military successes against Wu, Jia Chong continued to press for the invasion to be stopped after Jin forces had conquered the western half of Wu. Soon after he wrote a memorial to Emperor Wu arguing against the campaign, the Wu emperor Sun Hao surrendered to the Jin dynasty, thus ending Wu's existence. Jia Chong felt so ashamed that he offered to resign. However, Emperor Wu did not accept the resignation and even rewarded him for what he perceived to be Jia's contributions during the campaign.