Another serious crisis posed by Eastern Wu occurred in 234, when Eastern Wu, in a semi-coordinated effort with Shu Han, launched an attack against Cao Wei simultaneously with Zhuge Liang's Northern Expeditions. At the time, many frontline officials were on vacation visiting families, so Man Chong requested Cao Rui to call them back to fight Sun Quan. Cao Rui refused to cancel his subordinates' vacation, and ordered Man to focus on the defense. Cao Rui then personally led the royal army as reinforcement, and acted as an effective coordinator of the various forces that Cao Wei had on Eastern Wu's borders, and Eastern Wu was unable to make substantial gains.