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Following [[Zhuge Liang]]'s return after the [[battle of Jianwei]], [[Liu Shan]] issued an imperial decree to congratulate him on his recent success. He also restored Zhuge Liang to the position of Imperial Chancellor (丞相).{{sfnp|Sima|1084|loc=vol. 71}}<ref>(詔策亮曰：「街亭之役，咎由馬謖，而君引愆，深自貶抑，重違君意，聽順所守。前年耀師，馘斬王雙；今歲爰征，郭淮遁走；降集氐、羌，興復二郡，威鎮凶暴，功勳顯然。方今天下騷擾，元惡未梟，君受大任，幹國之重，而乆自挹損，非所以光揚洪烈矣。今復君丞相，君其勿辭。」) ''Sanguozhi'' vol. 35.</ref>
While in Wei, [[Cao Rui]] summoned [[Cao Zhen]] to the imperial capital [[Luoyang]], where he promoted him to Grand Marshal (大司馬) for his successful defense of Wei territory against Shu Han's expeditions.<ref>([太和]四年，朝洛陽，遷大司馬，賜劒履上殿，入朝不趨。) ''Sanguozhi'' vol. 9.</ref> During this meeting, Cao Zhen proposed that in response to Shu Han's multiple invasions.attacks, Cao Wei should launch their own invasion. He also said that if the various generals proceeded along several routes simultaneously then there could be great chance of success. [[Chen Qun]] prevailed against such a plan on the basicbasis, that when [[Cao Cao]] defeated [[Zhang Lu (Han dynasty)|Zhang Lu]], the army already methad difficulty with the transport of thetransporting provisions. He further said that the terrain of Hanzhong territory makes it hard to advance and retreat, withposing a great danger for the troops along with a waste of resources.{{efn|Chen Qun said; "Before, when Cao Cao launched a campaign against Zhang Lu., Hehe made sure to have a large quantity of both wheat and beans to havekeep the army well provisioned. Yet, before he defeated Zhang Lu, he alreadyran metinto problemproblems with provisions and could not find a solution. Moreover, the land is steep, Itit is difficult to advance or retreat, even moreespecially with transport. ForOur sure,troops ourwill troops wouldcertainly be intercepted and destroyed. If we use a large number of soldiers for this operation, Itit would be a waste. We must give this matter more consideration."<ref>(羣以爲「太祖昔到阳平攻張鲁，多收豆麦以益軍粮，鲁未下而食犹乏。今既无所因，且斜谷阻险，難以进退，转运必见钞截，多留兵守要，則损戰士，不可不熟虑也」。) ''Sanguozhi'' vol. 22.</ref>}} Cao Rui alongdiscussed the matter with Cao Zhen discussed this matter. Cao Zhen inplanned responseto changeduse thea roaddifferent that the army would followroute to Ziwu., Howeverbut Chen Qun again spoke against this plan. Cao Rui brought Chen Qun's arguments to Cao Zhen, but he was adamant in his decision and the campaign began.{{sfnp|Sima|1084|loc=vol. 71}}<ref>(真當發西討，帝親臨送。) ''Sanguozhi'' vol. 9.</ref>
==The Campaign==
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