Imperial Japanese Army soldiers advance to Lang Son, in September 1940 in French Indochina.
Date
22–26 September 1940 (4 days)
Location
French Indochina
Result
Japanese victory
Territorial changes
Japanese occupation of French Indochina
Belligerents
Japan
VNPQĐMH
Vichy France
French Indochina
Commanders and leaders
Aketo Nakamura Takuma Nishimura Trần Trung Lập
Georges Catroux Maurice Martin
Casualties and losses
Unknown
Uncertain (~900 according to sources)
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Japanese offensives, 1940–1942
1940
Manchukuo
Chongqing
South Guangxi
West Suiyuan
Wuyuan
Zaoyang–Yichang
French Indochina
Kaimingjie
Central Hubei
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1941
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1942
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Broome
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Operation K
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Tulagi
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Madagascar
Aleutian Islands
Midway
Sydney
Newcastle
Fort Stevens
Dureenbee
Mount Emily
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Military actions of Vichy France during World War II
1940
Attack on Mers-el-Kébir
Gibraltar
Battle of Dakar
Battle of Gabon
Japanese invasion of French Indochina
1940 Bắc Sơn uprising
Franco-Thai War
1940 Cochinchina uprising
Đô Lương mutiny
Battle of Yang Dang Khum
Battle of Phum Preav
Battle of Ko Chang
1941
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1942
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Operation Torch
Case Anton
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1944
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Battle of Mont Mouchet
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1945
1945 Ba Tơ uprising
Japanese coup d'état in French Indochina
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8 June 1945
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27 February 1941
8 May 1941
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13 November 1943
11 January 1944
14 February 1944
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17 July 1944
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French Indochina
The Japanese invasion of French Indochina (仏印進駐, Futsu-in shinchū) was a short undeclared military confrontation between Japan and Vichy France in northern French Indochina. Fighting lasted from 22 to 26 September 1940; the same time as the Battle of South Guangxi in the Sino-Japanese War, which was the main objective as to why Japan occupied Vietnam during this time.
The main objective of the Japanese was to prevent China from importing arms and fuel through French Indochina along the Kunming–Haiphong railway, from the Indochinese port of Haiphong, through the capital of Hanoi to the Chinese city of Kunming in Yunnan.[1]
Although an agreement had been reached between the French and Japanese governments prior to the outbreak of fighting,[2] authorities were unable to control events on the ground for several days before the troops stood down. As per the prior agreement, Japan was allowed to occupy Tonkin in northern Indochina, and thus effectively blockade China.
^Liardet, Jean-Philippe. "L'Indochine française pendant la Seconde Guerre mondiale" [French Indochina during World War II] (in French). Archived from the original on 5 February 2012.
^Cooper, Nikki. "French Indochina". Port.ac.uk. Retrieved 11 November 2021.
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