List of wars 1900–44

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1900–1919[edit]

1900–1919
Start Finish Name of Conflict Belligerents
Victorious party (if applicable) Defeated party (if applicable)
1900 1900 War of the Golden Stool  United Kingdom  Ashanti Empire
1900 1920 Somaliland Campaign
1901 1902 Anglo-Aro War  United Kingdom Aro Confederacy
1902 1903 Bailundo Revolt of 1902 Portuguese Empire Ovimbundu Kingdoms
1902 1903 Venezuela Crisis of 1902–03 Venezuela
 United States
 German Empire
 United Kingdom
 Kingdom of Italy
1902 1932 Unification of Saudi Arabia War Sultanate of Nejd
Allied Arab clans
Al Rashid
 Ottoman Empire
 Kingdom of Hejaz
1903 1904 British expedition to Tibet  United Kingdom  Tibet
1904 1907 Herero War  German Empire (including German colonial forces) Herero and Namaqua peoples
1904 1905 Russo-Japanese War  Empire of Japan  Russian Empire
 Principality of Montenegro
1905 1907 Revolution of 1905  Russian Empire Russia Revolutionaries
1906 1906 Dutch intervention in Bali (1906)  The Netherlands Badung
Tabanan
Klungkung
1906 1906 Bambatha Rebellion  British Empire Zulu
1907 1907 1907 Romanian Peasants' Revolt  Kingdom of Romania
1907 1907 Honduran-Nicaraguan War  Nicaragua Honduras
1908 1908 Dutch intervention in Bali (1908)  The Netherlands Karangasem
Klungkung
Gelgel
1908 1909 Persian Civil War IranPersia
1908 1908 Dutch–Venezuela War  The Netherlands Venezuela
1909 1910 Second Melillan campaign  Spain Riffian tribesmen
1909 1911 Ouaddai War  France Ouaddai Empire
1910 1920 Mexican Revolution  Mexico
1910 1919 Border War (1910–19)
Part of the Mexican Revolution
1911 1912 French conquest of Morocco  France Morocco
1911 1912 Italo-Turkish War  Kingdom of Italy  Ottoman Empire
1911 1912 Xinhai Revolution
1911 Revolution
Tongmenghui  Qing Empire of China
1912 1913 First Balkan War  Kingdom of Bulgaria
 Kingdom of Greece
 Kingdom of Serbia
 Kingdom of Montenegro
 Ottoman Empire
1912 1916 Contestado War Brazil Brazilian Governists Rebels
1912 1933 United States occupation of Nicaragua
Part of the Banana Wars
 United States Nicaraguan rebels
1912 1912 Negro Rebellion
Part of the Banana Wars
 Cuba
 United States
Independent Party of Color
1913 1913 Second Balkan War  Ottoman Empire
 Kingdom of Greece
 Kingdom of Serbia
 Kingdom of Montenegro
 Kingdom of Romania
 Kingdom of Bulgaria
1914 1921 Zaian War  France Zaian Confederation
1914 1918
(Armistice)

1919
(Treaty)
World War I Allies:

Belgium Kingdom of Belgium
 Kingdom of Serbia
 France
 Russian Empire (until March 1918)
 British Empire
 Kingdom of Italy (from April 1915)
 Canada
 Australia
 New Zealand
United States United States (from 1917)
 Kingdom of Montenegro
 Empire of Japan
Portugal Portuguese Republic (from March 1916)
 Kingdom of Romania (August 1916-May 1918)
 Kingdom of Greece (from June 1917)
Albania Albania
Brazil Brazil (from October 1917)
Armenia Armenia (from May 1918)
Bohemia Czechoslovakia
Thailand Kingdom of Siam
 San Marino (from June 1915)
Republic of China (1912–49) Republic of China (from August 1917)
Union of South Africa

Central Powers:

 Austro-Hungarian Empire
 German Empire (including German colonial forces)
 Ottoman Empire
 Kingdom of Bulgaria

1914 1914 United States occupation of Veracruz
Part of the Banana Wars
 United States  Mexico
1914 1915 Maritz Rebellion Union of South Africa "Bitterenders"
1915 1934 United States occupation of Haiti
Part of the Banana Wars
 United States  Haiti
1915 1917 Senussi Campaign
Part of World War I
 British Empire Senussi
 Ottoman Empire
Darfur Emirate
1915 1916 National Protection War
Anti-Monarchy War
 Republic of China Empire of China
1916 1917 Kaocen Revolt  France Tuareg guerrillas
1916 1916 Easter Rising United Kingdom British Army
Dublin Metropolitan Police
Royal Irish Constabulary
Republic of Ireland Irish Republican Brotherhood
Irish Volunteers
Irish Citizen Army
Cumann na mBan
Hibernian Rifles
Fianna Éireann
1916 1924 United States occupation of the Dominican Republic (1916–24)
Part of the Banana Wars
 United States Dominican rebels
1916 1918 Arab Revolt
Part of World War I
Arab Revolt Hashemite Arabs
United Kingdom United Kingdom

Saudi Arabia Sultanate of Nejd (Unification of Saudi Arabia)
 Ottoman Empire
1917 1917 February Revolution Russia Russian revolutionaries  Russian Empire
1917 1917 October Revolution Bolsheviks Russia Russian Provisional Government
1917 1923 Russian Civil War Victorious in Russia, Ukraine, Georgia, Armenia, Azerbaijan, Kazakhstan, and Mongolia:

 Russian SFSR
Other Soviet republics
Mongolian People's Party


Victorious in their respective countries:
Kingdom of Finland
Estonia Republic of Estonia
Latvia Republic of Latvia
Lithuania Republic of Lithuania
Poland Second Polish Republic

Russian Empire White Movement

Central Powers (until 1918):
 Austro-Hungarian Empire
 German Empire (including German colonial forces)
 Ottoman Empire
Allied Forces (from 1918):
Czechoslovakia Czechoslovakia
Republic of China (1912–49) Republic of China
France France
 Kingdom of Greece
 Kingdom of Italy
 Empire of Japan
Poland Poland
 Kingdom of Romania
 Kingdom of Serbia
 United Kingdom
 Australia
 Canada
 United States
Other combatants:
Revolutionary Insurrectionary Army of Ukraine
Ukrainian People's Republic
Democratic Republic of Georgia
Democratic Republic of Armenia
Various pro-independence movements

1917 1918 Soviet-Turkish War (1917-1918)
Part of Russian Civil War
 Ottoman Empire  Russian SFSR
1917 1921 Ukrainian War of Independence
Part of World War I and Russian Civil War
Ukrainian SSR
 Russian SFSR
Ukrainian People's Republic

West Ukrainian People's Republic
White Movement

1918 1918 Finnish Civil War Finnish White Guards
 German Empire
Finnish Red Guards
 Russian SFSR
1918 1918 Georgian–Armenian War Democratic Republic of Georgia Democratic Republic of Armenia
1918 1919 German Revolution of 1918–19  Weimar Republic Communist Forces:

Bavarian Soviet Republic
Spartacus League
German Communist movements

1918 1919 Greater Poland Uprising (1918–19) Poland Poland  German Empire
1918 1919 Polish–Ukrainian War
Part of the Ukrainian War of Independence
Poland Poland Ukraine West Ukrainian People's Republic
1918 1920 Georgian–Ossetian conflict (1918–20) Transcaucasian Democratic Federative Republic

Democratic Republic of Georgia

Pro-Bolshevik Ossetian rebels
1918 1920 Armenian–Azerbaijani War
Part of the Russian Civil War
 Azerbaijan Democratic Republic

 Ottoman Empire (1918 only)
 Russian SFSR (from April 1920)
Turkey Turkish Revolutionaries (from April 1920)

 Democratic Republic of Armenia

Nagorno-Karabakh Republic Republic of Mountainous Armenia
Nagorno-Karabakh Republic Nagorno-Karabakh rebels
 British Empire (1918 only)
Centrocaspian Dictatorship (1918 only)

1918 1920 Estonian War of Independence
Part of the Russian Civil War
 Estonia

Russia White Russia
 Latvia
 United Kingdom
Ingria
German Empire Ober Ost
Finnish, Swedish and Danish volunteers

 Russian SFSR

Commune of Estonia
 Latvian SSR

1918 1920 Latvian War of Independence
Part of the Russian Civil War
 Latvia

 Estonia
Poland Poland
 United Kingdom
France France

 Russian SFSR

 Latvian SSR

1918 1919 Lithuanian–Soviet War
Part of the Lithuanian Wars of Independence
Lithuania Lithuania
 Saxon volunteers
Russian Soviet Federative Socialist Republic
Lithuanian-Belorussian Soviet Socialist Republic
1918 1919 Al-Khurma dispute
Part of the Unification of Saudi Arabia
Emirate of Riyadh Kingdom of Hejaz

1919–1929[edit]

1919–1929
Start Finish Name of Conflict Belligerents
Victorious party (if applicable) Defeated party (if applicable)
1919 1919 Lithuanian War of Independence (War against the Bermontians)
Part of the Lithuanian Wars of Independence
Lithuania Lithuania Russia West Russian Volunteer Army
1919 1919 Polish–Czechoslovak War Czechoslovakia Czechoslovakia Poland Second Polish Republic
1919 1919 Hungarian–Romanian war of 1919  Romania Hungarian Soviet Republic
1919 1922
(Armistice)

1923
(Treaty)
Turkish War of Independence Turkey Grand National Assembly  Greece
France France
Armenia Armenia
 Italy
 United Kingdom
1919 1919 Third Anglo-Afghan War  Afghanistan  British Empire

 India

1919 1919 Portuguese Monarchist Civil War Portugal Portuguese Republican Party Portugal Kingdom of Portugal
1919 1920 Italo-Yugoslav War  Kingdom of Italy

Free State of Fiume

 Kingdom of Serbs, Croats and Slovenes
1919 1921 Polish–Soviet War
Poland Republic of Poland

Ukraine Ukrainian People's Republic

 Russian SFSR

Ukrainian SSR

1919 1919 First Silesian Uprising
Part of the Silesian Uprisings
 Weimar Republic Poland Silesian Rebels
1919 1921 Irish War of Independence Republic of Ireland Irish Republic  United Kingdom
1919 1922 Greco-Turkish War (1919–22)
Part of the Turkish War of Independence
Turkey Turkish Revolutionaries  Kingdom of Greece
1920 1920 Franco-Syrian War France France

French Syria

Arab Revolt Syrian Rebels
1920 1921 Franco-Turkish War
Part of the Turkish War of Independence
 Turkey  France
Armenia French Armenian Legion
1920 1920 Vlora War Albania Principality of Albania  Kingdom of Italy
1920 1926 Rif War France France

Spain Spain

Rif Republic
1920 1920 Polish–Lithuanian War
Part of the Lithuanian Wars of Independence
Poland Poland Lithuania Lithuania
1920 1920 Second Silesian Uprising
Part of the Silesian Uprisings
 Weimar Republic Poland German civil government and police of Upper Silesia
1920 1920 Turkish–Armenian War
Part of the Turkish War of Independence
Turkey Turkish Revolutionaries Democratic Republic of Armenia
1920 1920 Zhili–Anhui War Republic of China (1912–49) Zhili clique

Fengtian clique

Republic of China (1912–49) Anhui clique
1920 1921 Guangdong–Guangxi War Republic of China (1912–49) Old Guangxi clique Republic of China (1912–49) Chinese Revolutionary Party
1921 1921 Red Army invasion of Georgia
Part of the Russian Civil War
 Russian SFSR

Turkey Turkish revolutionaries

Democratic Republic of Georgia
1921 1921 Third Silesian Uprising
Part of the Silesian Uprisings
 Weimar Republic Poland Silesian Rebels

Poland Poland

1921 1921 1921 Persian coup d'etat Persian Cossack Brigade Iranian Qajar police

Jangalis

Colonel Pesian's forces
supported by:
 Soviet Union

1921 1922 East Karelian Uprising and Soviet–Finnish conflict 1921–22  Russian SFSR Finnish and East Karelian rebels
1922 1922 First Zhili–Fengtian War Republic of China (1912–49) Zhili clique Fengtian clique
1922 1923 Irish Civil War Republic of Ireland Pro-treaty forces Republic of Ireland Anti-treaty forces
1924 1924 August Uprising  Soviet Union Committee for Independence of Georgia
1924 1925 Saudi conquest of Hejaz Saudi Arabia

 British Empire

Hejaz
1924 1924 Second Zhili–Fengtian War Fengtian clique Republic of China (1912–49) Zhili clique
1925 1925 Incident at Petrich  Kingdom of Bulgaria  Kingdom of Greece
1925 1927 Great Syrian Revolt
1926 1927 Nicaraguan civil war (1926-1927) Nicaraguan Conservatives (government) Nicaraguan Liberals (rebels)
1926 1928 Northern Expedition  Republic of China Republic of China (1912–49) Beiyang Government
1926 1929 Cristero War  Mexico Cristeros
1927 1950 Chinese Civil War Communist Party of China
After 1949:
 People's Republic of China
Nationalist Party of China
Republic of China
After 1949:
 Republic of China on Taiwan
1928 1929 Afghan Civil War Barakzai dynasty

Tribal supporters
 British Empire (from 1929)

Tribal rebels

Forces of Habibullah Ghazi

1929 1929 Sino-Soviet conflict (1929)  Soviet Union  Republic of China
1929 1930 Igbo Women's War Igbo Women of Owerri and Calabar Provinces Warrant Chiefs

United Kingdom British Colonial Forces

1930–1944[edit]

1930–1944
Start Finish Name of Conflict Belligerents
Victorious party (if applicable) Defeated party (if applicable)
1930 1930 Yen Bai mutiny  French Indochina VNQDD
1930 1930 Central Plains War

Part of Chinese Civil War

Taiwan Forces of Chiang Kai-shek Taiwan Forces of the coalition of Yan Xishan, Feng Yuxiang, Wang Jingwei, and Li Zongren
1930 1932 Sino-Tibetan War  Republic of China Tibet Tibet
1931 1932 Japanese invasion of Manchuria  Empire of Japan  Republic of China
1931 1934 Kumul Rebellion  Republic of China  First East Turkestan Republic
1932 1932 Constitutionalist Revolution Brazil Brazil  São Paulo
1932 1932 Ecuadorian Civil War  Ecuador
1932 1932 January 28 Incident  Republic of China  Empire of Japan
1932 1935 Chaco War  Paraguay  Bolivia
1932 1933 Leticia Incident  Colombia  Peru
1932 1932 1932 Salvadoran peasant uprising
1934 1934 Soviet invasion of Xinjiang  Republic of China  Soviet Union
Russian Empire White Russian forces
Torgut Mongols
1934 1934 Austrian Civil War Austria First Austrian Republic

Fatherland's Front

Social Democratic Party of Austria
1934 1934 Saudi–Yemeni War Saudi Arabia Yemen Yemen
1935 1936 Second Italo-Abyssinian War  Kingdom of Italy  Ethiopian Empire
1936 1939 1936–39 Arab revolt in Palestine  United Kingdom
British Army
Palestine Police Force
Jewish Settlement Police
Jewish Supernumerary Police
Haganah
Special Night Squads
FOSH
Peulot Meyuhadot
Irgun
Peace Bands
Arab Higher Committee
1936 1939 Spanish Civil War National faction

Supported by:

Second Spanish Republic Republican faction

Supported by:

1937 1937 Islamic rebellion in Xinjiang (1937)  Soviet Union
Russian Empire White Russian forces
 Republic of China
1937 1945 Second Sino-Japanese War
Part of World War II
 Republic of China

Communist Party of China
 United States (from 1941)
 British Empire (from 1941)

 Empire of Japan

 Manchukuo
 Mengjiang

1938 1938 Battle of Lake Khasan  Soviet Union  Manchukuo

 Empire of Japan

1939 1939 Hungarian Invasion of the Carpatho-Ukraine  Kingdom of Hungary Ukraine Carpatho-Ukraine
1939 1939 Slovak–Hungarian War  Kingdom of Hungary Slovak Republic
1939 1939 Italian invasion of Albania  Kingdom of Italy Albania Albanian Kingdom
1939 1939 Battle of Khalkhin Gol  Soviet Union

Mongolia Mongolia

 Empire of Japan
 Manchukuo
1939 1945 World War II Allied Powers:

From 1939
Poland Poland
 Australia
France France
 New Zealand
 British Empire
 South Africa
 Canada
 Czechoslovakia (government-in-exile)
From 1940
 Denmark
 Norway
 Belgium
 Luxembourg
 Netherlands
 Free France
 Kingdom of Greece
 Kingdom of Yugoslavia
From 1941
 Soviet Union
 Panama
 Costa Rica
 Dominican Republic
 El Salvador
 Haiti
Honduras
 Nicaragua
 United States
 Republic of China
 Guatemala
 Cuba
 Philippines
From 1942
 Indian Empire
 Mexico
Brazil Brazil
 Ethiopia
From 1943
 Iraq
 Bolivia
 Colombia
Iran Iran
 Yugoslavia
From 1944
 Liberia
 Peru
 Kingdom of Italy (since 1944. Formerly a member of the Axis)
 Kingdom of Romania (formerly a member of the Axis)
Bulgaria (formerly a member of the Axis)
 San Marino (formerly a member of the Axis)
Albania
1945 Only
 Ecuador
 Paraguay
 Uruguay
 Venezuela
 Turkey
 Egypt
 Lebanon
 Syria
 Saudi Arabia
 Argentina
 Chile

Axis Powers:

 Nazi Germany
 Kingdom of Italy (1940–1944)
 Hungary (from 1940)
 Empire of Japan (from 1941)
 Bulgaria (1940–1944)
 Independent State of Croatia (from 1941)
 Kingdom of Romania (1941–1944)
Italian Social Republic (1943-1945)
Slovakia Slovakia
Non-Axis Co-belligerents:
 Manchukuo
 Mengjiang
China-Nanjing
 San Marino (1940-1943)
France Vichy France (1940-1944)
 Finland (1941–1944)
 Kingdom of Iraq (1941 only)
 Thailand (1942–1945)

1939 1940 Winter War
Part of World War II
 Soviet Union  Finland
1940 1941 Franco-Thai War
Part of World War II
 Thailand France Vichy France

 French Indochina

1941 1941 Ecuadorian–Peruvian War  Peru  Ecuador
1941 1941 Anglo-Iraqi War
Part of World War II
 United Kingdom

 British India
Jordan Transjordan

 Kingdom of Iraq

 Nazi Germany
 Kingdom of Italy

1941 1944 Continuation War
Part of World War II
 Soviet Union

 United Kingdom

 Finland

 Nazi Germany
 Kingdom of Italy

1942 1954 Hukbalahap Rebellion Philippines
United States
Hukbalahap
Soviet Union
Japan
1943 1949 Ukrainian Insurgent Army insurgency  Soviet Union

Poland People's Republic of Poland

Ukrainian Insurgent Army
1944 1947 Jewish insurgency in Palestine Jewish Resistance Movement United Kingdom British Army
United Kingdom Royal Navy
United Kingdom Royal Air Force
Palestine Police Force
1944 1953 Guerilla war in the Baltic states  Soviet Union EstoniaLatviaLithuania The Forest Brothers
1944 1945 Lapland War
Part of World War II
 Finland  Nazi Germany
1944 1949 Ili Rebellion Communist Party of China
Second East Turkestan Republic
 Soviet Union
Russia White Russian forces
Mongolian People's Republic
 Republic of China
National Revolutionary Army