Second Sino-Japanese War and the Wartime Republic (1937–1945)

1. Xi’an Incident forces anti-Japanese United Front

   Dec 12, 1936Labels: Chiang Kai-shek, Xi'an Incident, Second United

   On December 12, 1936, Chiang Kai-shek was seized in Xi’an by two of his own generals who demanded that he stop prioritizing the civil war and focus on resisting Japan. Negotiations ended with Chiang’s release and helped bring the Nationalists (KMT) and Communists (CCP) into a new cooperation called the Second United Front. This political shift set the stage for China’s wartime mobilization after open fighting with Japan began in 1937.

   • Britannica

2. Marco Polo Bridge Incident triggers full-scale war

   Jul 7, 1937Labels: Marco Polo, Beiping, Second Sino-Japanese

   On July 7, 1937, Chinese and Japanese troops clashed near the Marco Polo Bridge outside Beiping (now Beijing). What began as a local confrontation rapidly expanded, becoming the widely recognized start of the full-scale Second Sino-Japanese War. The incident ended the possibility of a limited conflict and pushed both governments toward wider military operations.

   • Britannica

3. Battle of Shanghai becomes major early showdown

   Aug 13, 1937Labels: Battle of, Shanghai, Chinese Nationalist

   From August 13 to November 26, 1937, China and Japan fought a large, costly battle for Shanghai. China committed major forces to resist Japan in a highly visible international city, but Japan ultimately captured most of Shanghai outside the foreign concessions. The battle showed both the scale the war would reach and the heavy civilian and military losses it would bring.

   • Shanghai Battle

4. Nationalist government establishes wartime capital at Chongqing

   Dec 11, 1937Labels: Chongqing, Nationalist government, wartime capital

   After Japanese forces threatened and then captured Nanjing, China’s Nationalist government shifted its leadership inland to continue the war. Chongqing was officially designated the capital on December 11, 1937, becoming the center of China’s wartime administration and diplomacy. This move helped the Republic of China maintain national leadership despite losing key coastal and river cities.

   • Chongqing History

5. Nanjing Massacre follows fall of Nanjing

   Dec 13, 1937Labels: Nanjing Massacre, Nanjing, Japanese Army

   After Japanese troops entered Nanjing on December 13, 1937, a period of mass killing and widespread violence against civilians and prisoners of war followed. Many histories describe the core period as lasting about six weeks, though some accounts use broader start and end dates based on the surrounding area. The atrocities became a lasting symbol of the war’s brutality and deepened Chinese resistance and international outrage.

   • Nanjing Massacre

6. Japanese air raids begin long Bombing of Chongqing

   Feb 18, 1938Labels: Bombing of, Chongqing, Imperial Japanese

   Beginning on February 18, 1938, Japan carried out sustained air raids against Chongqing, the wartime capital. The bombing campaign lasted for years and targeted the city’s administration, industry, and population centers, forcing widespread civil defense measures and mass displacement. Chongqing’s endurance under bombing became part of the Republic of China’s wartime identity and propaganda.

   • Chongqing Bombing

7. Yellow River dikes breached to slow Japanese advance

   Jun 1, 1938Labels: Yellow River, flooding policy, Kaifeng

   In June 1938, Nationalist forces destroyed Yellow River dikes near Kaifeng to hinder Japanese military movement. The deliberate flooding created a barrier but also caused a large-scale humanitarian and environmental disaster across multiple provinces. It showed how desperate China’s strategic situation had become and how civilians often bore the heaviest costs.

   • Britannica
   • 1938 Flood

8. Battle of Wuhan ends with Japanese capture of the city

   Oct 27, 1938Labels: Battle of, Wuhan, Chinese defense

   From June 11 to October 27, 1938, China fought to defend Wuhan, an important political and transport hub after the earlier loss of Nanjing. Japan captured Wuhan, but the long campaign exhausted forces on both sides and did not end Chinese resistance. The war increasingly shifted into a prolonged struggle, with China relying more on interior bases and extended supply routes.

   • Wuhan Battle

9. First Battle of Changsha checks Japanese advance in Hunan

   Sep 17, 1939Labels: Battle of, Changsha, Hunan

   From September 17 to October 6, 1939, Japanese forces attempted to seize Changsha, a key city in south-central China. Chinese forces repelled the attack, making it one of the notable Chinese victories of the mid-war period. The battle helped protect interior lines of communication and showed that Japan could be stopped in major conventional fighting, not only through guerrilla warfare.

   • Changsha 1939

10. Wang Jingwei’s Nanjing collaborationist regime established

    Mar 30, 1940Labels: Wang Jingwei, Nanjing collaboration, reorganized ROC

    On March 30, 1940, Wang Jingwei and his supporters set up a Japanese-backed government in Nanjing, presented as a “reorganized” Republic of China. The regime aimed to undercut Chiang Kai-shek’s government in Chongqing and legitimize Japanese control through a Chinese-led administration. Its creation deepened China’s internal political fractures during wartime and provided Japan a tool for occupation governance.

    • Wang Regime

11. New Fourth Army Incident strains the United Front

    Jan 4, 1941Labels: New Fourth, KMT-CCP rift

    In January 1941, Nationalist forces attacked and largely destroyed a Communist New Fourth Army force in southern Anhui. The incident badly damaged cooperation between the KMT and CCP, even though they were officially allied against Japan. It widened mistrust and set conditions for renewed civil conflict after Japan’s defeat.

    • New Fourth

12. Burma Road cut as Japan conquers Burma

    Apr 1, 1942Labels: Burma Road, Lashio, supply route

    The Burma Road, completed in 1939, had been a crucial overland supply route into China after Japan blocked much of China’s coastline. In April 1942, Japan seized Lashio in Burma, closing the road at its source and sharply reducing China’s access to external military supplies. The closure increased China’s dependence on difficult alternative routes and on Allied planning in the China-Burma-India theater.

    • Britannica

13. Doolittle Raid links China front to Pacific War escalation

    Apr 18, 1942Labels: Doolittle Raid, U S, China civilians

    On April 18, 1942, U.S. bombers launched from an aircraft carrier struck targets in Japan and then attempted to reach China. Many aircrews were aided by Chinese civilians and authorities after crash landings or bailouts. Japan soon carried out harsh reprisals in parts of China, showing how the wider Pacific War could directly intensify suffering and military pressure on China’s home front.

    • Britannica
    • US Army

14. Cairo Conference affirms Allied goals for postwar Asia

    Nov 22, 1943Labels: Cairo Conference, Chiang Kai-shek, Cairo Declaration

    From November 22 to 26, 1943, Chiang Kai-shek met with Franklin D. Roosevelt and Winston Churchill in Cairo to coordinate strategy against Japan. The leaders issued the Cairo Declaration, stating that Japan should be stripped of territories taken through aggression and that Korea should become independent. The meeting strengthened China’s status as a major Allied partner and tied China’s war aims to a broader postwar settlement.

    • Britannica
    • Cairo Decl

15. Ledo Road (Stilwell Road) opens to restore overland supply

    Jan 1, 1945Labels: Ledo Road, Stilwell Road, supply route

    After the Burma Road was cut, Allied forces built a new supply route from Ledo in India through northern Burma to connect with China. This road—often called the Ledo Road or Stilwell Road—opened in January 1945, improving the flow of fuel, equipment, and other supplies. It did not end the war by itself, but it helped reduce China’s isolation in the final phase of fighting.

    • Britannica

16. Japan’s surrender accepted in China at Nanjing ceremony

    Sep 9, 1945Labels: Nanjing surrender, Yasuji Okamura, He Yingqin

    Following Japan’s formal surrender in Tokyo Bay on September 2, 1945, a China-theater surrender ceremony was held in Nanjing on September 9, 1945. Japanese commander Yasuji Okamura signed surrender documents that were accepted by Nationalist General He Yingqin on behalf of the Allies and the Republic of China. The ceremony marked the war’s end in China and left unresolved political tensions that soon re-emerged in the Chinese Civil War.

    • Surrender China
    • SCIO