Qing invasion of Joseon

The Qing invasion of Joseon occurred in the winter of 1636 when the newly established Manchu Qing dynasty invaded Korea's Joseon kingdom, establishing its status as the center of the Imperial Chinese tributary system and formally severing Joseon's relationship with the Ming dynasty. The invasion was preceded by the Later Jin invasion of Joseon in 1627.

Background
The kingdom of Joseon continued to show ambivalence toward the Manchus after the Later Jin invasion of Joseon. Later Jin accused Joseon of harboring fugitives and supplying the Ming army with rations. In addition, Joseon did not recognize Hong Taiji's newly declared Qing dynasty. The Manchu delegates Inggūldai and Mafuta received a cold reception in Hanseong (Seoul, and King Injo of Joseon refused to meet with them or even send a letter, which shocked the delegates. A warlike message to Pyongan-do was also carelessly allowed to be seized by Inggūldai.

The beile (princes) were furious with Joseon's response to Qing overtures and proposed an immediate invasion of Joseon, but the Qing emperor Hong Taiji chose to conduct a raid against Ming first. After the successful operation against Ming, Hong Taiji turned towards Joseon and launched an attack in December 1636.

Prior to the invasion, Hong Taiji sent Abatai, Jirgalang, and Ajige to secure the coastal approaches to Korea, so that Ming could not send reinforcements. The defected Ming mutineer Kong Youde, ennobled as the Qing's Prince Gongshun, joined the attacks on Ganghwa and Ka ("Pidao"). The defectors Geng Zhongming and Shang Kexi also played prominent roles in the Korean invasion.

War
On 9 December 1636, Hong Taiji led Manchu, Mongol, and Chinese Banners against Joseon. Chinese support was particularly evident in the army's artillery and naval contingents.

Instead of engaging the forces of Im Gyeong Eop at the Baegma fortress in Uiju, Dodo, Dorgon and Hooge led a vanguard Mongol force straight to Hanseong to prevent King Injo from evacuating to Ganghwa Island as in the previous war. Hanseong's garrisons were defeated and the city was taken. 15,000 troops were mobilized from the south to relieve the city, but they were defeated by Dorgon's army.

Failing to escape, the king took refuge at the Namhan Mountain Fortress, which was immediately besieged by the Qing army. While Joseon officials were debating on a course of action, Dorgon occupied Ganghwa Island in a day and captured the second son and consorts of King Injo. Several attempts by Joseon forces from other regions to break the siege were foiled by Dodo, and sorties from the fortress yielded no success. Meanwhile, Hong Taiji's units advanced to the Imjin River and waited for it to freeze so they could cross over.

A message was sent to Injo stating that, to protect his family and his ancestral shrines, he needed to surrender. As the fortress was about to capitulate, Injo surrendered. The surrendering delegation was received at the Han River, where Injo turned over his Ming seals of investiture and three pro-war officers to Qing, as well as agreeing to the following terms of peace:


 * 1) Joseon stops using the Ming era name as well as abandon using the Ming seal, imperial patent, and jade books.
 * 2) Joseon offers the first and second sons of King Injo as well as the sons or brothers of ministers as hostages.
 * 3) Joseon accepts the Qing calendar.
 * 4) Joseon treats Qing as sovereign tributary overlord.
 * 5) Joseon sends troops and supplies to assist Qing in the war against Ming.
 * 6) Joseon offers warships for transporting Qing soldiers.
 * 7) The ministers of both Joseon and Qing become related in marriages.
 * 8) Joseon denies refugees from Qing territory.
 * 9) Joseon is not allowed to build castles.

Hong Taiji set up a platform in Samjeondo in the upper reach of the Han River. At the top of the platform he accepted King Injo's submission. King Injo kowtowed to Hong Taiji, who allegedly forced Injo to repeat the humiliating ritual many times. A monument in honor of the so-called excellent virtues of the Manchu Emperor was erected at Samjeondo, where the ceremony of submission had been conducted. In accordance with the terms of surrender, Joseon sent troops to attack Ka Island at the mouth of the Yalu River.

Shen Shikui was well ensconced in Ka Island's fortifications and hammered his attackers with heavy cannon for over a month. In the end, Ming and Korean defectors including Kong Youde landed 70 boats on the eastern side of the island and drew out his garrison in that direction. On the next morning, however, he found that the Qing—"who seem to have flown"—had landed to his rear in the northwest corner of the island in the middle of the night. Shen refused to surrender, but was overrun and beheaded by Ajige. Official reports put the casualties as at least 10,000, with few survivors. The Ming general Yang Sichang then withdrew the remaining Ming forces in Korea to Denglai in northern Shandong.

Aftermath
Joseon general Im Gyeong Eop, who was in charge of defending the Baegma fortress on the Qing-Joseon border, made his way down to Hanseong and ambushed a group of Qing soldiers making their return home, beheading its general Yaochui (要槌, nephew of Hong Taiji) in the process. As he was not aware of the surrender at the time, he was let go without any punishment by Hong Taiji who was greatly impressed by Im's courageous efforts on behalf of his kingdom. Im had actually requested military support from Hanseong at the beginning of the war (which never came) and planned to invade Mukden himself. Many Korean women were kidnapped and were raped at the hand of the Qing forces, and as a result were unwelcomed by their families even if they were released by the Qing after being ransomed. In 1648 Joseon was forced to provide several of their royal princesses as concubines to the Qing regent Prince Dorgon. In 1650 Dorgon married the Joseon Princess Yishun (義順公主). The Princess' name in Korean was Uisun and she was Prince Yi Kaeyoon's (Kumrimgoon) daughter. Dorgon married two Joseon princesses at Lianshan.

Koreans continued to harbor a defiant attitude towards the Qing dynasty in private while they officially yielded obedience and sentiments of Manchu barbarity continued to pervade Korean discourse. Joseon scholars secretly used Ming era names even after that dynasty's collapse and many thought that Joseon should have been the legitimate successor of the Ming dynasty and Chinese civilization instead of the "barbaric" Qing. Despite the peace treaty forbidding construction of castles, castles were erected around Seoul and northern region. Hyojong of Joseon lived as a hostage for seven years in Mukden until he succeeded Injo. Hyojong planned an invasion of Qing called Bukbeol (북벌, 北伐, Northern expedition) during his ten years on the Joseon throne, though the plan died with his death on the eve of the expedition.

From 1639 until 1894, the Joseon court trained corps of professional Korean-Manchu translators. These replaced earlier interpreters of Jurchen, who had been trained using the Jurchen script. The official designation was changed from "Jurchen" to "Manchu" in 1667. The first textbooks for this purpose were drawn up by Shin Gye-am, who had also been an interpreter of Jurchen and transliterated old Jurchen textbooks for this purpose.

Until 1894, Joseon remained a tributary state of the Qing dynasty, even though Manchu influence in Korea decreased from the late 18th century as Joseon began to prosper once again. The Empire of Japan forced the Qing dynasty to acknowledge the end of China's tributary relationship with Korea after the First Sino-Japanese War (1894-1895), and opened up Japanese influence in Korean affairs. Japan would later invade and annex Korea in the early 20th century.

An interesting historical note that historian Ji-Young Lee has brought up is that for much of Joseon's historical discourse following the invasion, the Manchu invasion was seen as a more important event than the Japanese invasions of Korea (1592–98), which while devastating, had not ended in complete defeat for Joseon. The defeat at the hands of 'barbarian' Manchus and the humiliation of the Joseon king as well as severance with their neighbor, the Ming dynasty, had a profound psychological impact on contemporary Korean society. The Japanese invasions, in contrast, had not created a fundamental change in the Ming world order which Joseon had been a part of. It was only after the rise of Japan during the 19th century and the following invasion and annexation of Korea that the 16th century Japanese invasions by Hideyoshi Toyotomi superseded the Qing invasion in significance.

Popular culture

 * Novel: Namhan sanseong by South Korean novelist Kim Hoon. It is based on the second invasion.
 * 2009: musical, Namhansanseong, based on the novel of the same name, but focuses on the lives of common people and their spirit of survival during harsh situations. It stars Yesung of boy band Super Junior as villain "Jung Myung-soo", a servant-turned-interpreter. It was shown from 9 October to 14 November at Seongnam Arts Center Opera House.
 * 2011 South Korean movie War of the Arrows is based on event which Choi Nam yi risked his life to save his sister.
 * The 2017 movie The Fortress is based on real historical events during the Qing Invasion of Joseon.