Wars, 20th Century

World War OneThis timeline details all the main wars that happened during the 20th Century

1899, 11th October to 1902, 31st May
Second Boer War (South African War)
British Empire against South African Republic, Orange Free State
1904, 8th February to 1905, 5th September
Russo-Japanese War
Russian Empire against Japan
1912, 8th October to 1913, 13th May
First Balkan War
Ottoman Empire against Greece, Serbia, Montenegro, Bulgaria
1913, 16th June 1913 to 18th July
Second Balkan War
Bulgaria against Greece, Serbia, Montenegro, Ottoman Empire, Romania
1914, 28th July to 1918, 11th November
Central Powers – Germany, Austria-Hungary, Ottoman Empire, Bulgaria against Allies (Entente) – British Empire, France, Russia
1918, May to 1920, November
Russian Civil War
Red Bolsheviks against White Tsarist
1920, 7th May to 1920, 12th October
Russo-Polish War
Soviet Union against Poland
1927, 12th April to 1950, 1st May (paused to fight Sino Japanese War)
Chinese Civil War
Chinese Nationalists against Chinese Communists
1936, 17th July to 1939, 1st April
Spanish Civil War
Spanish Nationalists against Spanish Republicans
1937, 7th July to 1945, 9th September
Second Sino-Japanese War from 1941 World War Two
China against Japan
1939, 1st September to 1945, 2nd September
Axis Powers – Germany, Italy, Japan, Hungary, Romania, Bulgaria against Allies – Soviet Union, United Kingdom, United States, France, Australia, Belgium, Brazil, Canada, China, Denmark, Greece, Netherlands, New Zealand, Norway, Poland, South Africa, Yugoslavia, Czechoslovakia
5th July 1941 to 31st July 1941
Ecuadorian-Peruvian War/ War of 1941
Fought between: Ecuador and Peru
Result: Ecuador renounced land claims against Peru and Peru agreed to withdraw troops from Ecuador
1945, August to 1950, April
Chinese Civil War
Communist Chinese against Nationalist Chinese
1946, 30th March to 1949, 16th October
Greek Civil War
Greek Government against Greek Communists
1946, 19th December to 1954, 1st August
First Indochina War
France, Vietnam, Laos, Cambodia against Viet Minh
1947 to 1991
USA, NATO, Western Bloc against USSR, Warsaw Pact, Eastern Bloc
1950, 25th June to 1953, 27th June
Korean War (part of the Cold War)
South Korea, United States, United Kingdom against North Korea, China, Soviet Union
1954, 1st November to 1962, 19th March
Algerian War
Algeria against France
1959, 26th September to 1975, 30th April
Vietnam War (part of the Cold War)
South Vietnam, United States against North Vietnam, Viet Cong, Khmer Rouge
1965, 15th August to 1965, 30th September
Indo-Pakistani War
India against Pakistan
1967, 30th May to 1970, 15th January
Biafran War
Biafra against Nigeria
1967, 5th June to 1967, 10th June
Six Day War
Israel against Egypt, Syria, Jordan
1971, 3rd December to 1971, 16th December
Indo-Pakistani War
India against Pakistan
1973, 6th October to 1973, 24th October
Yom Kippur War
Israel against Syria
1979, 25th December to 1989, February
Soviet Afghanistan War
Soviet Union against Afghanistan
19th March 1982 to 14th June 1982
Fought between: United Kingdom and Argentina
Result: United Kingdom prevented Argentina from taking the Falkland Islands.
1988, 1st March to 1999, 10th June
Kosovo War
Kosovo, Albania, Croatia, NATO against Yugoslavia
1990, 2nd August to 1991, 3rd March
Gulf War
Kuwait, UN Security Forces against Iraq
1991, 31st March to 1995, 12th November
Croatian War of Independence
Croatia, Bosnia and Herzegovina against Yugoslavia, Serbs
1991, 27th June to 1991, 7th July
The Ten Day War
Slovenia against Yugoslavia
1992, 1st March to 1995, 14th December
Bosnian War
Bosnia and Herzegovina, Croatia, NATO against Yugoslavia
1994, 11th December to 1996, 29th August
First Chechen War
Chechen Republic of Ichkeria against Russia



Published Jun 08, 2015 @ 10:05 pm – Updated – Sep 20, 2020 @ 1:48 pm

Harvard Reference for this page:

Heather Y Wheeler. (2015 – 2020). Wars, 20th Century. Available: https://www.totallytimelines.com/wars-20th-century. Last accessed August 23rd, 2021