Battle of Dongkou

The Battle of Dongkou was a naval battle fought in late 222 and early 223 between forces of the states of Cao Wei and Eastern Wu during the Three Kingdoms period of Chinese history. The battle concluded in a Wu Pyrrhic victory.

Background
After the Shu emperor Liu Bei was defeated by Sun Quan's forces at the Battle of Xiaoting, Sun benefited from his submission to the Wei ruler Cao Pi; who would help Sun in the conflict against Liu Bei. However, on both sides of the two forces, this was never a popular concept, especially in the ranks of Sun Quan, who defeated Cao Cao at the Battle of Red Cliffs 14 years ago after resisting surrender. To make matters worse, Cao Pi and his officers were uneasy about Sun's titles and ranks (such as King of Wu) because it was quite inappropriate since they were considered a vassal state under Wei. It was even considered within Sun Quan's forces that the alliance with Wei was futile, because the defeat they caused Liu Bei at Xiaoting was so critical that it meant that their alliance with Wei was no longer an asset for survival. Sun Quan also appeared as if he was planning to have this alliance go not much longer than it was supposed to.

In a matter of time, Cao Pi's plan to keep Sun Quan and Shu's relations sour backfired as Sun Quan and Liu Bei rekindled their alliance. In an attempt to improve his own relations with the Sun clan, he demanded Sun Deng (Sun Quan's eldest son) to be sent to the Wei capital Luoyang as a hostage. However Sun Quan declined this request, and later apologised to Cao Pi, stating his son was still very young and vulnerable in his health to be away from his home and family. Cao Pi did not bring up or press the matter. However Cao Pi demanded Sun Deng as hostage soon again. This was also declined.

Diplomatic ties between the two continued to sour until finally, Cao Pi would attack Sun Quan. Sun Quan would repetitively send envoys to negotiate peace between the two, but resulted in failure. Soon after, Sun Quan would proceed into declaring independence in November 222.

First moves
In autumn (ninth lunar month of 222) Cao Pi ordered Cao Xiu, Zhang Liao and Zang Ba to attack Dongkou (洞口); Cao Ren to attack Ruxu (濡須); and Cao Zhen, Xiahou Shang, Zhang He and Xu Huang to besiege Nan Commandery (南郡). In response, Sun Quan put Lü Fan in command of five armies to resist Cao Xiu; Zhuge Jin, Pan Zhang and Yang Can (楊粲) were dispatched to relieve the siege on Nan Commandery, Zhu Huan to defend Ruxu from Cao Ren.

Wei offensive
The Wei forces were initially easily penetrating the Wu front lines, no doubt because of their strength. In addition, Lü Fan's forces were hit by a storm, causing serious damage though Cao Xiu, because of the storms, achieved little out of his initial efforts. He was hot-headed, and he had to be advised strongly by his troops. Dong Zhao also assured to Cao Pi that Cao Xiu's troops would do this. Sun Quan was afraid when he heard that Zhang Liao was participating in the campaign, and said to his subordinates, "Even though Zhang Liao is ill, we should not underestimate him. Be careful!" Zhang Liao and the Wei generals later defeated Lü Fan. When Cao Xiu, Zhang Liao and Zang Ba launched their attack, Lü Fan, along with Xu Sheng, Quan Cong and Sun Shao, led naval forces to resist the enemy at Dongkou.

By this time it was early 223, and Cao Xiu ordered Zang Ba to attack Sun's small stronghold at Xuling. Though, Zang Ba achieved nothing and was quickly defeated. However, Cao Xiu eventually managed to gain the advantage as Lü Fan's forces were beginning to struggle.

Turn of events and Wei retreat
Miraculously, reinforcements arrived and Lü Fan's generals Sun Shao and Xu Sheng managed to put out a resistance against the Wei forces, continuously gaining morale due to the Wei struggle at Nan commandery and other locations along the western area of the Yangtze. Eventually, Cao Xiu and the Wei forces at Dongkou were ultimately repelled and withdrew to the Wei capital Luoyang.

Aftermath
Following the Wei defeat at Dongkou and failed invasion of the western Yangtze region, Sun Quan took his chance to launch an offensive during the summer of 223, successfully destroying the new Wei commandery at Qichun. The success of Sun Quan during his resistance against the Wei invasions would soon inspire Sun Quan to declaring himself emperor of Eastern Wu, being the last to establish the three dynasties during the Three Kingdoms period.

Sun Lang, also was banished from the Sun clan, and had to change his name to Ding Lang and was expelled from the army.

Wei forces

 * Great General who Conquers the East (征東大將軍) Cao Xiu (曹休), commanded the Wei forces
 * Mayor of the Capitol Zang Ba (臧霸), attacked Xuling
 * General of the Vanguard (前將軍) Zhang Liao (張遼), initially was involved in the battle, but was sent back to Wei due to illness
 * Assistant General (偏前軍) Zhang Hu (張虎), no historical information states he was involved in the battle

Sun Quan's forces

 * Administrator of Danyang (丹楊太守) Lü Fan (呂範), commanded Sun Quan's forces
 * Sun Quan's brother Sun Lang (孫朗), burnt his own forces supplies accidentally when trying to set fire to the Wei fleet.
 * Senior General-in-Chief (上大將軍) Lü Dai (呂岱), no official histories state that he was involved in the battle
 * General Quan Cong (全琮), part of the main army
 * Lieutenant General (偏將軍) Ding Feng (丁奉), initially defeated Zhang Liao early on


 * Governor of Lujiang Xu Sheng (徐盛), reinforced the main army and repelled the Wei forces
 * Marquis of Shanyin (山陰侯) He Qi (賀齊), reinforced the main army and restored morale
 * General Who Fortifies the North (鎮北將軍) Sun Shao (孫韶), reinforced the main army and helped repel the Wei forces

In fiction
In the historical novel Romance of the Three Kingdoms, the Wei general Zhang Liao was killed in this battle while defending Cao Pi from an attack by the Wu general Ding Feng. He was hit in the waist by an arrow fired by Ding Feng and died from his wound not long after the battle. Cao Pi held a grand funeral for Zhang Liao.

Historicity
Zhang Liao's biography in the Sanguozhi stated that he died of illness. In 222, he participated in the Battle of Dongkou against Wu forces even though he was ill. When Sun Quan heard that Zhang Liao was involved in the battle, he warned his men to be careful. Zhang Liao and other Wei generals defeated the Wu general Lü Fan in that battle. However, Zhang Liao's condition worsened and he died later that year in Jiangdu (江都; present-day Jiangdu District, Yangzhou, Jiangsu).

In modern references
The battle is a playable stage in the seventh instalment of Koei's Dynasty Warriors video game franchise. The stage is the final stage of the Wu story mode, and the player uses Sun Quan, and Sun Quan kills Zhang Liao. In the stage, though Cao Pi surrenders, later the game reveals in a following Wu cinematic clip that Sun Quan was dreaming.