Background
In 227, China was divided into three competing regimes - Cao Wei, Shu Han and Eastern Wu - each with the purpose of reunifying the empire of the fallen Han Dynasty. In the state of Shu, the strategic thinking behind the Northern Expeditions can be traced back as early as 207, when the 27-year-old Zhuge Liang outlined his Longzhong Plan to his lord Liu Bei. In it, he explained in very general terms the need to gain a viable geographical base, and then went on to detail a two-pronged strike north for mastery of the north. One advance would be from Yi Province in the west (covering the Sichuan Basin), north through the Qin Mountains, debouching into the Wei River valley and achieving a strategic position at the great metropolis Chang'an from which to dominate the great bend of the Yellow River. The second advance would be from Jing Province (covering present-day Hubei and Hunan) north toward the political center of Luoyang.
After Liu Bei established himself in Yi Province in 215, the essential prerequisites of the plan had been completed. The geopolitical arrangement envisaged by Zhuge Liang proved, however, to be a militarily unstable one. The alliance with the state of Wu in the east broke down over the issue of the occupation of Jing Province. By 223, the province had been lost and Liu Bei, as well as some of his top generals, were dead. Even after Zhuge Liang re-established friendly relations with Wu, his original plan had been markedly altered since only the left prong could be executed.
In Zhuge Liang's much quoted memorial Chu Shi Biao of 227, he explained to Liu Bei's son and successor Liu Shan in highly ideological terms the reasoning for his departure from the capital Chengdu: "We should lead the three armies to secure the Central Plain in the north. Contributing my utmost, we shall exterminate the wicked, restore the house of Han and return to the old capital. Such is this subject's duty in repaying the Former Emperor and affirming allegiance to Your Majesty."
Read more about this topic: Zhuge Liang's Northern Expeditions
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