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the claim

The Soviet Union invaded Poland in September 1939.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
9 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that the Soviet Union invaded Poland in September 1939?

Yes. Multiple reference and peer-reviewed sources state that the Soviet Union invaded Poland in September 1939, with several specifying 17 September. The claim is directly and fully supported.

Verdict: SUPPORTED · 9 sources for, 0 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 9
September 1939
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September 1939. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/September_1939

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More for · 8
Voroshilov’s ‘Lightning’ War–The Soviet Invasion of Poland, September 1939
2014
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Voroshilov’s ‘Lightning’ War–The Soviet Invasion of Poland, September 1939. (2014). doi.org. https://doi.org/10.1080/13518046.2014.932628

Were the Soviet Union and Nazi Germany de facto allies in September 1939?
2013
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Were the Soviet Union and Nazi Germany de facto allies in September 1939?. (2013). skeptics.stackexchange.com. https://skeptics.stackexchange.com/questions/17804/were-the-soviet-union-and-nazi-germany-de-facto-allies-in-september-1939

Poland under German and Soviet Occupation 1939–1941: Approaches to a Comparison
2023
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Pulvermacher, A. (2023). Poland under German and Soviet Occupation 1939–1941: Approaches to a Comparison. doi.org. https://doi.org/10.25627/202372411428

Jews in the Soviet Union during World War II: German occupation, Soviet evacuation, and the imagined relationship between these two experiences
2016
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Jews in the Soviet Union during World War II: German occupation, Soviet evacuation, and the imagined relationship between these two experiences. (2016). doi.org. https://doi.org/10.1080/13501674.2016.1164957

Betrayal of Poland: first-hand accounts from the Second World War
2024
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Betrayal of Poland: first-hand accounts from the Second World War. (2024). bvbr.bib-bvb.de:443. https://bvbr.bib-bvb.de:443/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=035607434&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA

“The Case of Fourteen” and the Polish Anti-Soviet Underground in Lviv during 1939-1941
2019
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Levyk, B. & Skorniewski, M. (2019). “The Case of Fourteen” and the Polish Anti-Soviet Underground in Lviv during 1939-1941. doi.org. https://doi.org/10.21847/1728-9343.2019.6(164).185935

What The World Rejected: Hitler's Peace Offers (1933 to 1940) by Dr. Friedrich Stieve
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Stieve, D. F. (n.d.). What The World Rejected: Hitler's Peace Offers (1933 to 1940) by Dr. Friedrich Stieve. archive.org. https://archive.org/details/what-the-world-rejected-hitlers-peace-offers-1933-1940-Friedrich-stieve

What The World Rejected: Hitler's Peace Offers 1933-1940
1940
Get citation
Stieve, D. F. (1940). What The World Rejected: Hitler's Peace Offers 1933-1940. archive.org. https://archive.org/details/what-the-world-rejected_202102

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