Japanese Intervention in French Indochina
World War II: The Middle Eastern Theater
Southern Asia 1941.0117
Japanese Intervention in French Indochina
World War II, East African Campaign, Allied invasions of Syria, Iraq and Iran (17 January 1941)
Historical Map of South & Southwest Asia
Germany's defeat of France in 1940 left the French overseas empire vulnerable. Japan, which was already at war with China, decided to exploit this opportunity and invaded northern French Indochina. It was soon followed by Thailand, which retook territories French Indochina had annexed earlier in the century.
Changes to the map 07 August 1940 - 17 January 1941
French Indochina: The Japanese have occupied northern French Indochina. Thailand has seized upon this opportunity to invade and reclaim lost provinces.
British Somaliland: The Italians have taken Berbera, completing their conquest of the territory.
Sudan: The Italians are beginning their evacuation of Kassala.
Vichy French Empire: French India (Pondicherry) has declared for the Free French.
British Protectorates in the Persian Gulf
The British Residency of the Persian Gulf maintained British India's influence in a number of Gulf states from the 19th Century until 1947. These states were nominally independent - and shown as such in most atlases from the period - but all signed treaties guaranteeing British control over their foreign affairs.
The Sultanate of Muscat and Oman was the only one of these states with significant international relations, having obtained trade agreements with the US and France before it signed its treaty with Britain. Maps of the time often show Trucial Oman and even Qatar as regions of Oman.
Trucial Oman was the region to the west of Oman which collectively signed treaties with Britain. The sheikhdoms of this region were often called the Trucial States, and later became the United Arab Emirates. However at this time they had little unity, with no regional council until 1952.
The British Indian Empire, also known as the British Raj, was comprised of a complex of presidencies, provinces, protectorates, and agencies. Only the top level subdivisions are shown here.
The area under direct British rule was known as British India and made up of presidencies and provinces - a presidency simply being the name for an older province.
Outside British India, but often included within the sphere of the presidencies/provinces, were the hundreds of protectorates or 'princely states'. These were indirectly ruled states, the largest being Hyderabad, Kashmir, and Mysore. The others were either collected into agencies - which might in turn contain other smaller agencies - or fell under the sway of the provinces.
Japanese invasion of French Indochina
The Empire of Japan and Vichy French Indochina sign an accord granting Japan the rights to station up to 6,000 troops in Indochina, and to move troops and supplies through Indochina. Within a few hours, columns from the IJA 5th Division cross the border at three places and close in on the railhead at Lang Son, near Longzhou, contravening the new agreement. French Indochinese colonial troops and Foreign Legionaires contest the invasion until 25 September. On the 26th, Japanese forces come ashore at Dong Tac and move on Haiphong, with fighting coming to an end that day.
Joachim von Ribbentrop of Nazi Germany, Galeazzo Ciano of the Kingdom of Italy, and Saburō Kurusu of the Empire of Japan sign the Tripartite Pact in Berlin, capital of Germany. The 10 year Pact recognizes the right of Germany and Italy to establish a new order in Europe while Japan does so in Greater East Asia; it also compels the contracting Powers to come to the aid of any one of them that is attacked by a Power not presently involved in either World War II in Europe or the Sino-Japanese War.
British reopening of Burma Road
Following the Japanese occupation of northern French Indochina and the continuation of Japanese offensives in China, the United Kingdom ends its conditional three month closure of the Burma Road, allowing supplies to reach Nationalist China again.
Following a number of border skirmishes along the disputed Mekong frontier, war erupts between the Kingdom of Thailand and Vichy-controlled French Indochina. While the superior Royal Thai Air Force bombs cities in Laos and Cambodia, the Thai army overruns French border defenses. The war is brought to an end by a Japanese mediated ceasefire, after which French Indochina is forced to cede most of the disputed territory to Thailand.