岳飞的孤军北伐有多不容易？诸葛亮看完都要感谢刘禅！How difficult was Yue Fei's lone Northern Expedition?

绍兴九年（1139年、金天眷二年）秋，完颜兀术、完颜斡本（汉名宗干）等人发动政变，杀死主和的完颜挞懒等人，完颜兀术进拜都元帅、兼领 行台尚书省 ，成为金朝新的掌权者。绍兴十年（1140年）五月，金熙宗以完颜挞懒擅割河南地为由撕毁和约，降诏元帅府，下令复取河南、陕西之地。 赵构和秦桧迫于形势，只得改变态度，令诸将迎击金军；又声讨金都元帅兀术，颁布赏格；宋廷继而于六月一日命三大宣抚使韩世忠、张俊、岳飞兼河南、北诸路招讨使之衔，分别晋封 太保 、 少师 、 少保 。 [308] 赵构又命岳家军火速支援顺昌，并表示允许岳飞举兵北伐，收复失地。 正当西线金军受阻，东线顺昌解围，局势稍有稳定时，赵构却又命时任司农少卿的 李若虚 向岳飞传达诏命，谕岳飞“兵不可轻动，宜且班师”。六月下旬，李若虚赶到已开至 德安府 （湖北 安陆 ）的岳飞军中传达旨意。岳飞向李若虚陈述他恢复中原的谋略，李若虚素主抗金，又原是岳飞宣抚司中参议官，遂不顾矫诏之罪，主动支持岳飞北伐。
In the autumn of the ninth year of Shaoxing (1139, the second year of Jin Tianjuan), Wanyan Wushu, Wanyan Wuben (Chinese name Zongqian) and others launched a coup, killing Zhuhe Wanyan Talan and others, Wanyanwu Shujin paid homage to the Marshal of the capital and concurrently led the Taishangshu Province, becoming the new ruler of the Jin Dynasty. In May of the 10th year of Shaoxing (1140), Jin Xizong tore up the peace treaty on the grounds that Wanyan Talan was too lazy to cut off the land of Henan. Due to the situation, Zhao Gou and Qin Hui had to change their attitudes and order the generals to meet the Jin army; they also denounced Marshal Wushu of Jindu and issued rewards; the Song court then ordered the three envoys Han Shizhong, Zhang Jun, and Yue Fei on June 1 He also recruited envoys from various routes in Henan and the north, and granted the titles of Taibao, Shaoshi, and Shaobao respectively. [308] Zhao Gou also ordered Yue's army to quickly support Shunchang, and said that he would allow Yue Fei to send troops to the north to recover the lost land. Just when the Jin army on the western front was blocked and Shunchang on the eastern front was relieved, and the situation was a little stable, Zhao Gou ordered Li Ruoxu, who was then the Shaoqing of Sinonong, to convey an edict to Yue Fei, telling Yue Fei, "Soldiers should not be moved lightly, and it is better to fight against the enemy." return after victory". In late June, Li Ruoxu rushed to Yue Fei's army who had already arrived at De'an Mansion (Anlu, Hubei) to convey his will. Yue Fei stated to Li Ruoxu his strategy of restoring the Central Plains. Li Ruoxu was always in charge of resisting the gold, and was originally the counselor of Yue Fei's Xuanfu Department, so he took the initiative to support Yue Fei's Northern Expedition regardless of the crime