Editing Northern Wei (section)

== Wars with the Southern dynasties ==
{{See also|Northern and Southern dynasties}}

=== War with Liu Song ===
[[File:Tomb Terracotta Group of Figurines, Northern Wei (tomb of Sima Jinlong).jpg|thumb|upright=2|Army of Northern Wei terracotta soldiers in [[Xianbei]] uniform, tomb of [[Sima Jinlong]], 484 CE.<ref>{{cite book |last1=Dien |first1=Albert E. |title=Six Dynasties Civilization |date=1 January 2007 |publisher=Yale University Press |isbn=978-0-300-07404-8 |url=https://books.google.com/books?id=0zp6iMZoqt0C&pg=PA223 |language=en}}</ref>]]
War between Northern Wei and Han-ruled [[Liu Song]] dynasty broke out while the former had not yet unified northern China. [[Emperor Wu of Song]] while still a Jin dynasty general, had conquered both [[Southern Yan]] in 410 and [[Later Qin]] in 417, pushing Jin frontiers further north into Wei territories. He then usurped the Jin throne and created the Song dynasty. After hearing the death of the Song emperor Wu in 422, Wei's emperor [[Emperor Mingyuan of Northern Wei|Mingyuan]] broke off relations with Song and sent troops to invade its southern neighbor. His plan is to seize three major cities south of the Yellow River: Luoyang, Hulao, and Huatai. Sizhou (司州, central Henan) and Yanzhou (兗州, modern western Shandong) and most cities in Song's Qing Province (青州, modern central and eastern Shandong) fell to the Wei army. The Liu Song general [[Tan Daoji]] commanded an army to try to save those cities and were able to hold Dongyang (東陽, in modern Qingzhou, Shandong), the capital of Qingzhou province. Northern Wei troops were eventually forced to withdraw after food supplies ran out. Wei forces also stalled in their siege of Hulao, defended by the capable Liu Song general Mao Dezu (毛德祖), but were meanwhile able to capture Luoyang and Xuchang (許昌, in modern Xuchang, Henan) in spring 423, cutting off the path of any Liu Song relief force for Hulao. In summer 423, Hulao fell. The campaign then ceased, with Northern Wei now in control of much of modern Henan and western Shandong.

[[File:Northern Wei warrior, tomb mural, Datong.jpg|thumb|left|Northern Wei warrior, tomb mural, Datong]]
[[Emperor Wen of Song]] continued the northern campaigns of his father. In 430, under the able general Dao Yanzhi, Liu Song recovered the four cities of Luoyang, Hulao, Huatai and Qiao'ao south of the Yellow River. However, the emperor's unwillingness to advance past this line caused the destruction of the empire's ally, [[Tiefu|Xia]], by the Wei. The emperor was to repeat this mistake as several northern states such as [[Northern Yan]] who had offered to ally with Liu Song against Wei were declined, eventually leading to Wei's unification of the North in 439.

In 450, Emperor Wen attempted to destroy the Northern Wei by himself and launched a massive invasion. Although initially successful, the campaign turned into a disaster. The Wei lured the Liu Song to cross the Yellow River, and then flanked them, destroying the Eastern army.

As the Liu Song armies retreated, [[Emperor Taiwu of Northern Wei|Emperor Taiwu]] ordered his troop to move south. The provinces south of the Yellow River were devastated by the Wei army. Only Huatai, a fortified city, held out against the Wei. Wei troops retreated in January 451, however, the economic damage to the Song was immense. Emperor Wen made another attempt to conquer Northern Wei in 452, but failed again. On returning to the capital, he was assassinated by the heir apparent, Liu Shao.

In 466, [[Liu Zixun]] waged an unsuccessful civil war against the Emperor Ming of Liu Song. The governors of Xu Province (徐州) and Yan Province (兗州, modern western Shandong), who earlier pleaded allegiance to Liu Zixun, in fear of reprisal from the Liu Song emperor Emperor Ming, surrendered these territories to rival Northern Wei. Northern Wei forces quickly took up defense position against the attacking forces sent by Emperor Ming. With Liu Song forces unable to siege [[Pengcheng]] effectively, they were forced to withdraw in spring 467, making these populous provinces lost to the Northern Wei.

=== War with Southern Qi ===
In 479, [[Xiao Daocheng]] usurped the throne of Liu Song and became emperor of the new [[Southern Qi]] dynasty. Upon hearing the news, the Northern Wei emperor prepared to invade under the pretext of installing Liu Chang, son of [[Emperor Wen of Song]] who had been in exile in Wei since 465 AD.

Wei troops began to attack [[Shouyang]] but could not take the city. The Southern Qi began to fortify their capital, Jiankang in order to prevent further Wei raids.

Multiple sieges and skirmishes were fought until 481 but the war was without any major campaign. A peace treaty was signed in 490 with the [[Emperor Wu of Southern Qi|Emperor Wu]].

=== War with Liang ===
[[File:Northern Wei soldier.jpg|thumb|Northern Wei officer. Tomb statuette, [[Luoyang]] Museum.]]
In 502, the Southern Qi general [[Xiao Yan]] toppled the emperor [[Xiao Baojuan]] after waging a three-year civil war against him. Xiao Yan enthroned in Jiankang to become Emperor Wu of the [[Liang dynasty]].

As early as 503 AD, the Northern Wei was hoping to restore the Southern Qi throne. Their plan was to install [[Xiao Baoyin]], a Southern Qi prince, to become emperor of the puppet state. A southern expedition was led by Prince Yuan Cheng of Wei and Chen Bozhi, a former Qi general. Until spring 505, Xinyang and Hanzhong were fallen to the Northern Wei.

In 505, Emperor Wu began the Liang offensive. A strong army was quickly amassed under the general [[Wei Rui (Liang dynasty)|Wei Rui]] and caught the Wei by surprise, calling it the strongest army they have seen from the Southern dynasties in a hundred years. In spring 506, Wei Rui was able to capture [[Hefei]]. In fall 506, Wei Rui attacked the Northern Wei army stationed at Luokou for nearly a year without advancing. However, when Wei army gathered, Xiao Hong Prince of Linchuan, the Liang commander and younger brother of Emperor Wu, escaped in fear, causing his army to collapse without a battle. Northern Wei forces next attacked the fortress of Zhongli (鍾離, in modern [[Bengbu]]), However, they were defeated by a Liang army commanded by Wei Rui and [[Cao Jingzong]], effectively ending the war. After the [[Battle of Zhongli]], there would continue to be border battles from time to time, but no large-scale war for years.

In 524, while Northern Wei is plagued by agrarian rebellions to the north and west, Emperor Wu launched a number of attacks on Wei's southern territory. Liang forces largely met little resistance. In spring 525, the Northern Wei general Yuan Faseng (元法僧) surrendered the key city of Pengcheng (彭城, in modern Xuzhou, Jiangsu) to Liang. However, in summer 525, Emperor Wu's son Prince Xiao Zong (蕭綜), grew suspicions that he was actually the son of Southern Qi's emperor Xiao Baojuan (because his mother Consort Wu was formerly Xiao Baojuan's concubine and had given birth to him only seven months after she became Emperor Wu's concubine), surrendered Pengcheng to Northern Wei, ending Liang's advances in the northeast, although in summer 526, Shouyang fell to Liang troops after Emperor Wu successfully reemployed the damming strategy. For the next several years, Liang continued to make minor gains on the borders with Northern Wei.

[[File:Cernuschi Museum 20060812 128 (detail).jpg|thumb|left|Mounted warrior of the Northern Wei dynasty from the collections of the [[Musée Cernuschi]].]]
In 528, after a coup in Northern Wei, with the warlord [[Erzhu Rong]] overthrowing Empress Dowager Hu, a number of Northern Wei officials, including Yuan Yue, Yuan Yu, and Yuan Hao fled and surrendered territories they controlled to Liang. In winter 528, Emperor Wu created Yuan Hao the Prince of Wei—intending to have him lay claim to the Northern Wei throne and, if successful, become a Liang vassal. He commissioned his general Chen Qingzhi (陳慶之) with an army to escort Yuan Hao back to Northern Wei. Despite the small size of Chen's army, he won battle after battle, and in spring 529, after Chen captured Suiyang (modern Shangqiu). Yuan Hao, with Emperor Wu's approve, proclaimed himself the emperor of Northern Wei. In summer 529, troops under Erzhu unable to stand up to Chen Qingzhi, forcing Emperor Xiaozhuang of Northern Wei to flee the capital Luoyang. After capturing Luoyang, Yuan Hao secretly wanted to rebel against Liang: when Chen Qingzhi requested Emperor Wu to send reinforcements, Yuan Hao sent Emperor Wu a submission advising against it, and Emperor Wu, believing Yuan Hao, did not send additional troops. Soon, Erzhu and Emperor Xiaozhuang counterattacked, and Luoyang fell. Yuan Hao fled and was killed in flight, and Chen's own army was destroyed, although Chen himself was able to flee back to Liang.

In 530, Emperor Wu made another attempt to establish a vassal regime in Northern Wei by creating Yuan Yue the Prince of Wei, and commissioning Yuan Yue's uncle Fan Zun (范遵) with an army to escort Yuan Yue back to Northern Wei. Yuan Yue made some advances, particularly in light of the disturbance precipitated soon thereafter when Emperor Xiaozhuang ambushed and killed Erzhu Rong and was in turn overthrown by Erzhu Rong's nephew Erzhu Zhao and cousin Erzhu Shilong. However, Yuan Yue realized that the Erzhus then became firmly in control of Luoyang and that he would be unable to defeat them, and so returned to Liang in winter 530.

In 532, with Northern Wei again in civil war after the general Gao Huan rose against the Erzhus, Emperor Wu against sent an army to escort Yuan Yue back to Northern Wei, and subsequently, Gao Huan welcomed Yuan Yue, but then decided against making Yuan Yue emperor. Subsequently, Emperor Xiaowu of Northern Wei, whom Gao made emperor, had Yuan Yue executed.

With Northern Wei divided into Eastern Wei and Western Wei in light of Emperor Xiaowu's flight, Emperor Wu initially continued to send his forces to make minor territorial gains on the borders, against both Eastern Wei and Western Wei, for several years.