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Soviet troops cross Bug River and march into Poland

The Soviet invasion of Poland was a military conflict by the Soviet Union without a formal declaration of war.

The Soviet invasion of Poland was a military conflict by the Soviet Union without a formal declaration of war. On 17 September 1939, the Soviet Union invaded Poland from the east, 16 days after Nazi Germany invaded Poland from the west. Subsequent military operations lasted for the following 20 days and ended on 6 October 1939 with the two-way division and annexation of the entire territory of the Second Polish Republic by Nazi Germany and the Soviet Union. This division is sometimes called the Fourth Partition of Poland. The Soviet (as well as German) invasion of Poland was indirectly indicated in the "secret protocol" of the Molotov–Ribbentrop Pact signed on 23 August 1939, which divided Poland into "spheres of influence" of the two powers.

Historical Significance

The Soviet invasion of Poland was a military conflict by the Soviet Union without a formal declaration of war.

Events Before

  1. German officer Claus von Stauffenberg is promoted to Lieutenant Colonel

    Claus Philipp Maria Justinian Schenk Graf von Stauffenberg was a German army officer who is best known for his failed attempt on 20 July 1944 to assassinate Adolf Hitler at the Wolf's Lair, part of…

  2. Negro Baseball League star Josh Gibson suffers a nervous breakdown and is admitted to the hospital for rest and treatmen

    Negro Baseball League star Josh Gibson suffers a nervous breakdown and is admitted to the hospital for rest and treatment; he is released in time for preseason training

  3. Adolf Hitler declares "Total War" against the Allies

    Adolf Hitler declares "Total War" against the Allies

  4. Soviets announce they have broken the long siege of Leningrad by Nazi Germany by opening a narrow land corridor, though

    Soviets announce they have broken the long siege of Leningrad by Nazi Germany by opening a narrow land corridor, though the siege is not fully lifted until a year later

  5. German Field Marshal Friedrich Paulus surrenders to Soviet troops at Stalingrad

    Friedrich Wilhelm Ernst Paulus (23 September 1890 – 1 February 1957) was a German Generalfeldmarschall (Field Marshal) during World War II who is best known for his surrender of the German 6th Army…

Events After

  1. German air raid on Allied airfields at Eindhoven, Saint-Trond, and Brussels

    German air raid on Allied airfields at Eindhoven, Saint-Trond, and Brussels

  2. Franklin D. Roosevelt is sworn in for an unprecedented and never-to-be-repeated fourth term as US President

    Franklin D. Roosevelt is sworn in for an unprecedented and never-to-be-repeated fourth term as US President

  3. Soviet troops liberate Auschwitz and Birkenau Concentration Camps in Poland - now commemorated as International Holocau

    Soviet troops liberate Auschwitz and Birkenau Concentration Camps in Poland - now commemorated as International Holocaust Remembrance Day [1]

  4. WWII: US troops under General Douglas MacArthur enter Manila in the Philippines after a month-long battle, ending three

    WWII: US troops under General Douglas MacArthur enter Manila in the Philippines after a month-long battle, ending three years of Japanese military occupation

  5. Declaration of Liberated Europe is signed at the Yalta Conference by Franklin D. Roosevelt, Winston Churchill, and Josep

    Declaration of Liberated Europe is signed at the Yalta Conference by Franklin D. Roosevelt, Winston Churchill, and Joseph Stalin, declaring that liberated nations are to establish democratic governments through free elections

More from the 1940s

D-Day: The Normandy Landings

Allied forces launch the largest amphibious invasion in history on the beaches of Normandy, France, marking the beginning of the liberation of Western Europe from Nazi occupation.

wars conflicts

World War II: Representatives of 26 nations at war with the Axis powers sign the Declaration of the United Nations, pled

World War II: Representatives of 26 nations at war with the Axis powers sign the Declaration of the United Nations, pledging to make no separate peace deals

Mahatma Gandhi begins a march for peace in East Bengal

Mohandas Karamchand Gandhi (2 October 1869 – 30 January 1948) was an Indian lawyer, anti-colonial nationalist, and political thinker who employed nonviolent resistance to lead the successful campaign…

birth

Omar al-Bashir is born

Omar al-Bashir is born

Frequently Asked Questions

What happened on July 17, 1944?
The Soviet invasion of Poland was a military conflict by the Soviet Union without a formal declaration of war. On 17 September 1939, the Soviet Union invaded Poland from the east, 16 days after Nazi Germany invaded Poland from the west. Subsequent military operations lasted for the following 20 days and ended on 6 October 1939 with the two-way division and annexation of the entire territory of the Second Polish Republic by Nazi Germany and the Soviet Union.
Why is Soviet troops cross Bug River and march into Poland significant?
The Soviet invasion of Poland was a military conflict by the Soviet Union without a formal declaration of war.

Explore More

July 17 in HistoryYear 1944