Declarations of war during World War II

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Animated map of the European theatre of war during WWII

This is a timeline of formal declarations of War during World War II .

Contents

A declaration of war is a formal act by which one nation goes to war against another. The declaration is usually an act of delivering a performative speech (not to be confused with a mere speech) or the presentation of a signed document by an authorized party of a national government in order to create a state of war between two or more sovereign states. The official international protocol for declaring war was defined in The Hague Peace Conference of 1907 (or Hague II). [1] For the diplomatic maneuvering behind these events, which led to hostilities between nations during World War II, see the article entitled Diplomatic history of World War II.

List of war declarations

Below is a table showing the outbreak of wars between nations which occurred during World War II. Indicated are the dates (during the immediate build-up to, or during the course of, World War II), from which a de facto state of war existed between nations. The table shows both the "Initiator Nation(s)" and the nation at which the aggression was aimed, or "Targeted Nation(s)". Events listed include those in which there were simple diplomatic breaking of relations that did not involve any physical attack, as well as those involving overt declarations or acts of aggression. In rare cases, war between two nations occurred twice, with an intermittent period of peace. The list here does not include peace treaties or periods of any armistice.


Table Legend: Concerning Declaration of War: A = Attack without prior, formal declaration of war; U = State of war arrived at through use of ultimatum;
W = Formal declaration of war made.

Outbreaks of war between nations during World War II
DateInitiator nation(s)Targeted nation(s)Declaration of war: TypeNotes/commentsDocument/event
1939-09-01 Flag of Germany (1935-1945).svg Germany Flag of Poland (1928-1980).svg Poland U [2] [3] German attack began at 4:44 a.m., Berlin and Warsaw time. [4] [2] [5] Invasion
1939-09-01Flag of First Slovak Republic 1939-1945.svg  Slovak Republic Flag of Poland (1928-1980).svg Poland A Invasion
1939-09-03Flag of the United Kingdom.svg  United Kingdom
Flag of France.svg France
Flag of Australia (converted).svg  Australia
Flag of New Zealand.svg  New Zealand
Flag of Germany (1935-1945).svg Germany U [2] [3] At 11:15 a.m. London time, [6] British PM, Neville Chamberlain publicly delivered his Ultimatum Speech. [3] [7] [8] As the Statute of Westminster 1931 was not yet ratified by the parliaments of Australia, and New Zealand, the British declaration of war on Germany also applied to the following dominions. United Kingdom declaration, French declaration
1939-09-04Flag of Nepal.svg  Nepal Flag of Germany (1935-1945).svg Germany W

Declaration

1939-09-05Flag of Morocco.svg Morocco
Flag of Tunisia (1959-1999).svg Tunisia
Flag of Germany (1935-1945).svg Germany WAs protectorates of France governed by resident-generals, hostilities between both Tunisia and Morocco and Germany fluctuated throughout the war. Initially declaring war and commiting forces under French command that participated in the 1940 campaign, the Armistice between Vichy and the Germans led to a suspending of hostilities. After Operation Torch, a state of war resumed between Morocco and Germany, which went on to employ large numbers of troops for the Allies. Tunisia was invaded by the Germans in response to Operation Torch.Declaration
1939-09-05Flag of South Africa (1928-1994).svg South Africa Flag of Germany (1935-1945).svg Germany W [2] [3] Declaration
1939-09-10Flag of Bahrain (1932 to 1972).svg Bahrain
Canadian Red Ensign (1921-1957).svg  Canada
Flag of Muscat.svg Oman
Flag of Germany (1935-1945).svg Germany W [2] [3] Declaration

Declaration

Declaration

1939-09-17Flag of the Soviet Union (1936-1955).svg  Soviet Union Flag of Poland (1928-1980).svg Poland A [2] [3] Invasion
1939-10-11 Flag of Jordan.svg Transjordan Flag of Germany (1935-1945).svg Germany WDeclaration
1939-11-30Flag of the Soviet Union (1936-1955).svg  Soviet Union Flag of Finland.svg  Finland A [2] [3] Second war between these nations (after Finnish invasion in 1918-1920). Invasion
1940-04-09 Flag of Germany (1935-1945).svg Germany Flag of Denmark.svg  Denmark
Flag of Norway.svg  Norway
A [2] Invasion of Denmark
Invasion of Norway
1940-04-12Flag of the United Kingdom.svg United Kingdom Flag of the Faroe Islands.svg  Faroe Islands A [3] Invasion
1940-05-10 Flag of Germany (1935-1945).svg Germany Flag of Belgium (civil).svg  Belgium
Flag of the Netherlands.svg  Netherlands
A/W [2] [3] Date of the German offensive in the West, W from Belgium and the Netherlands. [9]

Belgium

Netherlands

1940-05-10 Flag of Germany (1935-1945).svg Germany Flag of Luxembourg.svg  Luxembourg A [3] Luxembourg
1940-05-10Flag of the United Kingdom.svg  United Kingdom Flag of Iceland.svg Iceland A Invasion
1940-06-10Flag of Italy (1861-1946) crowned.svg Italy Flag of France.svg France
Flag of the United Kingdom.svg  United Kingdom
W [2] [3] France and the UK
1940-06-10Canadian Red Ensign (1921-1957).svg  Canada Flag of Italy (1861-1946) crowned.svg Italy W [2] Declaration
1940-06-11Flag of South Africa (1928-1994).svg South Africa
Flag of Australia (converted).svg  Australia
Flag of New Zealand.svg  New Zealand
Flag of Italy (1861-1946) crowned.svg Italy W [2]

South Africa

Australia

New Zealand

1940-06-11Flag of France.svg France Flag of Italy (1861-1946) crowned.svg Italy W [2] Declaration
1940-06-25Flag of the United Kingdom.svg  United Kingdom Flag of France (1794-1958).svg Vichy France A Vichy France cuts off diplomatic relations with the United Kingdom on 8 July 1940. Attack
1940-09-09Flag of Italy (1861-1946) crowned.svg Italy Flag of Egypt (1922-1958).svg Egypt AEgypt never formally declared war on Italy. Invasion
1940-09-22Merchant flag of Japan (1870).svg  Japan Flag of France (1794-1958).svg Vichy France A Invasion
1940-09-23Flag of Free France (1940-1944).svg Free France
Flag of the United Kingdom.svg  United Kingdom
Flag of Australia (converted).svg  Australia
Flag of France (1794-1958).svg Vichy France A Invasion
1940-10-??Flag of Thailand.svg  Thailand Flag of France (1794-1958).svg Vichy France A Franco-Thai War
1940-10-28Flag of Italy (1861-1946) crowned.svg  Italy Flag of Greece (1822-1978).svg Greece U [3] Italy invades Greece Invasion
1941-02-05Flag of Free France (1940-1944).svg Free France Flag of Italy (1861-1946) crowned.svg Italy A Invasion
1941-04-06 Flag of Germany (1935-1945).svg Germany Flag of Greece (1822-1978).svg Greece W [2] [3] Invasion
1941-04-06 Flag of Germany (1935-1945).svg Germany Flag of Yugoslavia (1918-1943).svg Yugoslavia A [2] [3] Invasion
1941-04-06Flag of Italy (1861-1946) crowned.svg Italy
Flag of Hungary (1915-1918, 1919-1946).svg Hungary
Flag of Yugoslavia (1918-1943).svg Yugoslavia A [3] Invasion
1941-04-14 Flag of Germany (1935-1945).svg Germany Flag of Egypt (1922-1958).svg Egypt AEgypt did not formally declare war until 1945. Invasion
1941-05-02Flag of the United Kingdom.svg United Kingdom Royal Standard of Iraq (1930-1958).svg Iraq A Invasion
1941-06-08Flag of Free France (1940-1944).svg Free France Flag of Germany (1935-1945).svg Germany A Invasion
1941-06-22 Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
Flag of Romania.svg Romania
Flag of the Soviet Union (1936-1955).svg  Soviet Union A [2] [3] A timed-declaration of war was given by Germany at the time of the attack [10] Invasion
1941-06-22 Flag of the Tuvan People's Republic (1941-1943).svg
Tuva
Flag of Germany (1935-1945).svg Germany WTuva was a client state of the Soviet Union. Part of the USSR from 1944.
1941-06-25Flag of Finland.svg  Finland Flag of the Soviet Union (1936-1955).svg  Soviet Union W Finland recognized a state of war with the Soviet Union; third war between these nations. Continuation War
1941-06-27Flag of Hungary (1915-1918, 1919-1946).svg Hungary Flag of the Soviet Union (1936-1955).svg  Soviet Union W [3] Invasion
1941-08-25Flag of the Soviet Union (1936-1955).svg  Soviet Union
Flag of the United Kingdom.svg  United Kingdom
Flag of Australia (converted).svg  Australia
State Flag of Iran (1925).svg Iran A Invasion
1941-12-05Flag of the United Kingdom.svg  United Kingdom Flag of Finland.svg  Finland
Flag of Romania.svg Romania
Flag of Hungary (1915-1918, 1919-1946).svg Hungary
W [11] Declaration
1941-12-07Merchant flag of Japan (1870).svg  Japan Flag of the United States (1912-1959).svg  United States
Flag of the United Kingdom.svg  United Kingdom
A [2] W (Japanese point of view); A (British Empire and United States)

Declaration

Attack on Pearl Harbor

Invasion of Malaya

Attack on Singapore

Invasion of Hong Kong

1941-12-07Canadian Red Ensign (1921-1957).svg  Canada
Flag of Australia (converted).svg  Australia
Flag of New Zealand.svg  New Zealand
Merchant flag of Japan (1870).svg  Japan
Flag of Finland.svg  Finland
Flag of Romania.svg Romania
Flag of Hungary (1915-1918, 1919-1946).svg Hungary
W [3]

Canada

Australia

New Zealand

1941-12-07Flag of the United Kingdom.svg  United Kingdom Flag of Romania.svg Romania
Flag of Finland.svg  Finland
Flag of Hungary (1915-1918, 1919-1946).svg Hungary
W [3] Declaration
1941-12-07Flag of Panama.svg  Panama Merchant flag of Japan (1870).svg  Japan W [3] Declaration
1941-12-08Flag of the United States (1912-1959).svg  United States
Flag of the United Kingdom.svg  United Kingdom
Flag of Australia (converted).svg  Australia
Flag of Costa Rica.svg  Costa Rica
Flag of the Dominican Republic.svg  Dominican Republic
Flag of El Salvador.svg  El Salvador
Flag of Guatemala.svg  Guatemala
Flag of Haiti.svg  Haiti
Flag of Honduras.svg  Honduras
Flag of the Netherlands.svg  Netherlands
Flag of New Zealand.svg  New Zealand
Flag of Nicaragua.svg  Nicaragua
Flag of the Philippines (navy blue).svg  Philippines
Merchant flag of Japan (1870).svg  Japan W [3] United States declaration

British declaration
Australian declaration
Costa Rican declaration
Dominican Republic's declaration
Guatemalan declaration
Salvadorian declaration
Haitian declaration
Honduran declaration
Dutch declaration
New Zealand's declaration
Nicaraguan declaration
Philippine declaration

1941-12-08Flag of South Africa (1928-1994).svg South Africa Merchant flag of Japan (1870).svg  Japan W [3] South African declaration
1941-12-08Flag of the Republic of China.svg  China
Flag of Italy (1861-1946) crowned.svg Italy
Merchant flag of Japan (1870).svg  Japan
W [3] China and Japan had been at war since 1937 Second Sino-Japanese war

Declaration

1941-12-08Flag of the People's Republic of Mongolia (1940-1992).svg Mongolia Flag of Germany (1935-1945).svg Germany W[ citation needed ]

Mongolian declaration

1941-12-09Flag of Australia (converted).svg  Australia
Flag of New Zealand.svg  New Zealand
Merchant flag of Japan (1870).svg  Japan W [3]

Australian declaration

New Zealand's declaration

1941-12-11 Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
Flag of the United States (1912-1959).svg  United States W [2] [3]

German declaration

Italian declaration

1941-12-11Flag of the United States (1912-1959).svg  United States Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
W [2] Germany

Italy

1941-12-11Flag of Poland (1928-1980).svg Poland (in-exile)Merchant flag of Japan (1870).svg  Japan W [2] Japan rejected declaration of War. Prime Minister Hideki Tōjō's answer was following: "We don't accept the Polish declaration of war. The Poles, fighting for their freedom, declared war under the British pressure".
1941-12-12Flag of Romania.svg Romania
Flag of Bulgaria.svg Bulgaria
Flag of the United States (1912-1959).svg  United States
Flag of the United Kingdom.svg  United Kingdom
W [3]

Romanian declaration

Bulgarian declaration

1941-12-12Flag of Australia (converted).svg  Australia
Flag of the Netherlands.svg  Netherlands
Flag of Portugal.svg Portugal A Portugal maintained neutrality throughout World War II.

Invasion

1941-12-13Flag of the United Kingdom.svg  United Kingdom
Flag of New Zealand.svg  New Zealand
Flag of South Africa (1928-1994).svg South Africa
Flag of Bulgaria.svg Bulgaria W [3]

British declaration

New Zealand's declaration

South African declaration

1941-12-13Flag of Hungary (1915-1918, 1919-1946).svg Hungary Flag of the United States (1912-1959).svg  United States W [3] Declaration
1941-12-14Flag of Independent State of Croatia.svg Independent State of Croatia Flag of the United States (1912-1959).svg  United States
Flag of the United Kingdom.svg  United Kingdom
W [3] Declaration
1941-12-16Flag of the Czech Republic.svg Czechoslovakia (In-exile) Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
Flag of Finland.svg  Finland
Flag of Romania.svg Romania
Flag of Hungary (1915-1918, 1919-1946).svg Hungary
Flag of Japan.svg Japan
Flag of Bulgaria.svg Bulgaria
Flag of Independent State of Croatia.svg Independent State of Croatia [12]
W Declaration
1941-12-17Flag of Albania (1939-1943).svg Albania Flag of the United States (1912-1959).svg  United States W Declaration
1941-12-20Flag of Belgium (civil).svg  Belgium Merchant flag of Japan (1870).svg  Japan W Declaration
1942-01-01 United Nations Axis Powers WDeclared during Arcadia Conference Declaration
1942-01-06Flag of Australia (converted).svg  Australia Flag of Bulgaria.svg Bulgaria W Declaration
1942-01-16Royal Standard of Iraq (1930-1958).svg Iraq Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
Merchant flag of Japan (1870).svg  Japan
W Declaration
1942-01-25Flag of Thailand.svg  Thailand Flag of the United Kingdom.svg  United Kingdom
Flag of the United States (1912-1959).svg  United States
A Declaration
1942-01-25Flag of the United Kingdom.svg  United Kingdom
Flag of New Zealand.svg  New Zealand
Flag of South Africa (1928-1994).svg South Africa
Flag of Thailand.svg  Thailand W

British declaration

New Zealand's declaration

South African declaration

1942-02-12Flag of Peru (1825-1950).svg  Peru Flag of Germany (1935-1945).svg Germany
Merchant flag of Japan (1870).svg  Japan
W Declaration
1942-02-19Merchant flag of Japan (1870).svg  Japan Flag of Portugal.svg Portugal A Portugal maintained neutrality throughout World War II. Invasion
1942-05-05Flag of South Africa (1928-1994).svg South Africa
Flag of the Netherlands.svg Netherlands (in-exile)
Flag of Poland (1928-1980).svg Poland
Flag of France (1794-1958).svg Vichy France A Invasion
1942-05-05Flag of the United Kingdom.svg United Kingdom
Flag of Northern Rhodesia (1939-1964).svg Northern Rhodesia
Flag of Southern Rhodesia (1924-1964).svg Southern Rhodesia
Flag of South Africa (1928-1994).svg South Africa
Flag of Tanganyika (1923-1961).svg Tanganyika
Flag of Congo Free State.svg Belgian Congo
Flag of France (1794-1958).svg Vichy France
Merchant flag of Japan (1870).svg  Japan
A Invasion
1942-05-22Flag of Mexico (1934-1968).svg  Mexico Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
Merchant flag of Japan (1870).svg  Japan
W [3] Declaration
1942-06-13Flag of the Iroquois Confederacy.svg Iroquois Confederacy Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
Merchant flag of Japan (1870).svg  Japan
WOnly Native American tribe to have declared war on the Axis powers separately from the United States. Announced on the steps of the U.S. Capitol by a representative that "a state of war exists between our Confederacy of Six Nations on the one part and Germany, Italy, Japan and their allies against whom the United States has declared war, on the other part." Declaration
1942-08-22Flag of Brazil (1889-1960).svg Brazil Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
W Declaration
1942-11-08Flag of the United States (1912-1959).svg United States
Canadian Red Ensign (1921-1957).svg Canada
Flag of France (1794-1958).svg Vichy France A Invasion
1942-11-10 Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
Flag of France (1794-1958).svg Vichy France A Invasion
1942-11-12 Flag of Germany (1935-1945).svg Germany Flag of Tunisia (1959-1999).svg Tunisia AGerman invasion via airlifting serval divisions in reaction to Operation Torch, swiftly occupying Tunis and the eastern part of the country, and capturing the western portions after stiff French Tunisian resistance before the allies reached the Tunisian border. In the resulting Tunisian campaign the Allies finally defeated the Axis forces in Africa.Invasion
1942-12-14Flag of Ethiopia (1897-1936; 1941-1974).svg Ethiopia Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
Merchant flag of Japan (1870).svg  Japan
WOn 3 October 1935, Italy invaded Ethiopia without a formal declaration of war. In response to the Italian invasion, Ethiopia declared war on Italy. Most of Ethiopia was occupied by Italy in 1936, however parts of Ethiopia remained under the control of the Ethiopian Patriots Movement, which begun its guerrilla war against the occupying Italian forces the day Addis Ababa fell in May 1936. In May 1941, Addis Ababa was liberated by the Gideon Force, restoring sovereignty to Ethiopia. Second Italo-Ethiopian War

Declaration

1943-01-20Flag of Chile.svg  Chile Flag of Germany (1935-1945).svg Germany
Flag of Italy (1861-1946) crowned.svg Italy
WPresident Ríos officially suspended all trade and diplomatic relations with the Axis powers, and Chile officially joined the Allies as authorities began rooting out Nazi spies from Operation Bolivar. While only declaring war on Germany and Italy (although Chile would not declare war on Japan until 1945, it began imprisoning Japanese nationals in 1943), the American government and international press celebrated this day as Chile declaring war on the Axis. Declaration
1943-04-02Flag of Bolivia.svg  Bolivia Axis powers WBolivia officially joined the Allies on 7 April 1943. Shortly after war was declared, the President, Enrique Peñaranda, was overthrown in a coup. Bolivian mines supplied needed tin to the Allies, but no troops or warplanes were sent overseas. Bolivians remained confident their geographic isolation would protect them from the war. Declaration
1943-09-01Flag of the Republic of China-Nanjing (Peace, Anti-Communism, National Construction).svg China Regime of Wang Jingwei Allied Powers W Declaration
1943-09-08 Flag of Germany (1935-1945).svg Germany Flag of Albania (1939-1943).svg Albania AAfter Italy's capitulation to the Allied powers, Germany swiftly invaded Albania (an Italian satellite state) to preempt a possible Allied intervention. German occupation of Albania
1943-09-09State Flag of Iran (1925).svg Iran Flag of Germany (1935-1945).svg Germany W Declaration
1943-10-13Flag of Italy (1861-1946) crowned.svg Italy Flag of Germany (1935-1945).svg Germany W [2] Italy had changed sides after the fall of Mussolini. The Declaration of War was given by Pietro Badoglio to the German ambassador in Madrid. [2] Declaration
1943-11-26Flag of Colombia.svg Colombia Flag of Germany (1935-1945).svg Germany WSee Colombia during World War II Declaration
1944-01-17Flag of Free France (1940-1944).svg Free France Flag of Italy.svg Italian Social Republic A Invasion
1944-01-27Flag of Liberia.svg Liberia Flag of Germany (1935-1945).svg Germany
Merchant flag of Japan (1870).svg  Japan
W Declaration
1944-06-06
Flag of France.svg France
Flag of Germany (1935-1945).svg Germany A Invasion
1944-07-25
Flag of France.svg France
Merchant flag of Japan (1870).svg  Japan A Invasion
1944-08-25Flag of Romania.svg Romania Flag of Germany (1935-1945).svg Germany
Flag of Hungary (1915-1918, 1919-1946).svg Hungary
WRomania switched sides Declaration
1944-09-05Flag of the Soviet Union (1936-1955).svg  Soviet Union Flag of Bulgaria.svg Bulgaria W Declaration
1944-09-08Flag of Bulgaria.svg Bulgaria Flag of Germany (1935-1945).svg Germany WBulgaria switched sides Declaration
1944-09-15 Flag of Germany (1935-1945).svg Germany Flag of Finland.svg  Finland A Lapland War
1944-09-23Flag of the Philippines (1943-1945).svg  Second Philippine Republic Flag of the United States (1912-1959).svg  United States
Flag of the United Kingdom.svg  United Kingdom
W [13] Philippine declaration
1944-12-31Flag of Hungary (1915-1918, 1919-1946).svg Hungary Flag of Germany (1935-1945).svg Germany W [14] Hungary switched sides Declaration
1945-02-02Flag of Ecuador.svg  Ecuador Flag of Germany (1935-1945).svg Germany
Merchant flag of Japan (1870).svg  Japan
W Ecuadorian declaration
1945-02-07Flag of Argentina.svg  Argentina
Flag of Paraguay (1842-1954).svg  Paraguay
Flag of Germany (1935-1945).svg  Nazi Germany
Merchant flag of Japan (1870).svg  Japan
W

Argentinean declaration

Paraguayan declaration

1945-02-15Flag of Venezuela (1863-1905).svg Venezuela
Flag of Uruguay.svg  Uruguay
Flag of Germany (1935-1945).svg Germany
Merchant flag of Japan (1870).svg  Japan
W

Venezuelan declaration

Uruguayan declaration

1945-02-21Flag of San Marino (before 2011).svg  San Marino Flag of Germany (1935-1945).svg Germany W Declaration
1945-02-23Flag of Turkey.svg  Turkey Flag of Germany (1935-1945).svg Germany
Merchant flag of Japan (1870).svg  Japan
W Declaration
1945-02-24Flag of Egypt (1922-1958).svg Egypt Flag of Germany (1935-1945).svg Germany
Merchant flag of Japan (1870).svg  Japan
W Declaration
1945-02-26Flag of Syria (1932-1958; 1961-1963).svg Syria
Flag of Lebanon.svg  Lebanon
Flag of Germany (1935-1945).svg Germany
Merchant flag of Japan (1870).svg  Japan
W Declaration
1945-02-28Flag of Saudi Arabia (1938-1973).svg  Saudi Arabia Flag of Germany (1935-1945).svg Germany W Declaration
1945-03-03Flag of Finland.svg  Finland Flag of Germany (1935-1945).svg Germany WFinland switched sides Lapland War
1945-04-01Flag of Saudi Arabia (1938-1973).svg  Saudi Arabia Merchant flag of Japan (1870).svg  Japan W Declaration
1945-04-11Flag of Chile.svg  Chile Flag of Japan.svg Japan W Declaration
1945-07-06Flag of Brazil (1889-1960).svg Brazil Merchant flag of Japan (1870).svg  Japan W Declaration
1945-07-09Flag of Norway.svg  Norway Merchant flag of Japan (1870).svg  Japan W Declaration [15]
1945-07-14Flag of Italy (1861-1946) crowned.svg Italy Merchant flag of Japan (1870).svg  Japan W Declaration
1945-08-08Flag of the Soviet Union (1936-1955).svg  Soviet Union Merchant flag of Japan (1870).svg  Japan W [2] Last outbreak of war during the entire Second World War. Declaration
1945-08-10Flag of the People's Republic of Mongolia (1940-1992).svg Mongolia Merchant flag of Japan (1870).svg  Japan W [16] W (de jure) A (de facto 1945-08-09) War declared 24 hours after crossing the border with Soviet troops

Soviet Invasion of Manchuria Mongolia in World War II

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References

  1. On the Opening of Hostilities; 1907; Yale Law School Library; retrieved March 2014.
  2. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 "2194 Days of War"; (1977); Salmaggi, C. & Pallasvini, A.; ISBN   91-582-0426-1; per tables included. [Italian; American]
  3. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Timeline Data Archived May 5, 2016, at the Wayback Machine ; World at War online; retrieved February 2014.
  4. "Germans invade Poland". History.com. Retrieved 1 Dec 2019.
  5. On This Day
  6. Mann, Andrea. "September 3, 1939: Britain declares war on Germany after Hitler's troops invade Poland". BT.com. Retrieved 1 Dec 2019.
  7. Note: Included in the speech: "...This morning, the British Ambassador in Berlin handed the German Government a final note, stating that unless we heard from them by 11 O'clock that they were prepared at once to withdraw their troops from Poland a state of war would exist between us. I have to tell you now that no such undertaking has been received and that consequently this country is at war with Germany..."
  8. 1939: Britain and France declare war on Germany, BBC
  9. Swedish Encyklopedia; "Bonniers Lexikon" (Vol. 1); (c.1960s); table in article by Andra Världskriget: The Second World War; Pp. 461-462.
  10. "The Rise and Fall of the Third Reich"; Shirer, William L
  11. Declaration of War on Finland, Hungary and Romania
  12. all countries at war with the United States, United Kingdom, or the Soviet Union
  13. Hungary declares war on Germany
  14. https://trove.nla.gov.au/newspaper/article/2634950
  15. Christopher P. Atwood (1999), "Sino-Soviet Diplomacy and the Second Partition of Mongolia, 1945–1946", Mongolia in the Twentieth Century: Landlocked Cosmopolitan, Bruce A. Elleman and Stephen Kotkin, eds. (Armonk, NY: M. E. Sharpe), 147.