After Japan’s 1592 invasion of Korea created a major regional crisis, the Wanli-era Ming state decided to intervene militarily in support of its tributary ally Joseon, setting the stage for large-scale Ming expeditionary warfare on the peninsula.
Ming court official Song Yingchang was appointed to oversee preparations and logistics for the Korea expedition, coordinating troop mobilization and supply for the coming intervention.
A forward Ming contingent under Wu Weizhong crossed into Korea, marking the opening phase of Ming ground intervention prior to the main army’s arrival.
General Li Rusong brought the principal Ming field army to the Yalu River, enabling a full-scale offensive to relieve northern Korea and retake key cities from Japanese occupation.
Ming and Joseon forces jointly besieged and recaptured Pyongyang, forcing Japanese troops to withdraw and reversing Japan’s early strategic gains in northern Korea.
At Byeokjegwan, Japanese forces defeated a Ming-led column under Li Rusong, slowing the allied drive toward Hanseong (Seoul) and highlighting the risks of overextended cavalry-led advances.
Joseon defenders under Gwon Yul repelled a major Japanese assault at Haengju, helping pressure Japanese forces around Hanseong during the period of Ming–Joseon counteroffensives.
Following allied pressure and diplomacy, Japanese forces increasingly consolidated into fortified coastal positions near Busan, shaping the war into a protracted contest over southern strongholds and sea lines.
During the mid-war lull associated with negotiations, Ming troops were reported withdrawn from Korea, reflecting the uneasy ceasefire dynamics before the conflict reignited.
Diplomacy collapsed as expectations diverged among the Ming court, Joseon, and Hideyoshi’s regime, removing the fragile framework that had limited large-scale operations for several years.
In the renewed conflict, Japanese forces captured Namwon after a multi-day siege; the battle involved both Joseon defenders and Ming troops, underscoring the depth of Ming re-engagement in 1597.
Ming forces under Ma Gui fought Japanese troops at Jiksan, a significant check on Japanese attempts to advance toward Hanseong during the second invasion phase.
Admiral Yi Sun-sin won a decisive naval victory at Myeongnyang, helping disrupt Japanese maritime mobility and setting conditions for later Ming–Joseon naval cooperation.
Ming–Joseon forces attempted to take the Japanese fortress at Ulsan but ultimately withdrew, illustrating the difficulty of reducing heavily fortified Japanese coastal castles despite large allied armies.
Allied Ming–Joseon forces besieged Suncheon Japanese Castle but did not capture it, leaving an important Japanese strongpoint intact late in the war.
At Sacheon, Japanese defenders withstood an allied siege and inflicted heavy losses; the outcome hindered coordinated allied efforts to eliminate remaining Japanese fortifications in 1598.
A later 1598 allied attempt around Ulsan again failed to force a decisive breakthrough, and Ming–Joseon forces lifted the operation, while Japan prepared for withdrawal after Hideyoshi’s death.
The combined Joseon–Ming fleets defeated Japanese forces at Noryang Strait, a final major battle of the invasions; Admiral Yi Sun-sin was killed during the action, and Japan completed its evacuation soon after.
Imjin War: Ming Intervention in Korea (1592–1598)
