Question: The German invasion began one week after the signing of what neutrality pact between Nazi Germany and the Soviet Union signed in Moscow on 23 August 1939?
Sentence (from "Invasion of Poland"): The Invasion of Poland, known in Poland as the September Campaign ("Kampania wrześniowa") or the 1939 Defensive War ("Wojna obronna 1939 roku"), and in Germany as the Poland Campaign ("Polenfeldzug") or "Fall Weiss" ("Case White"), was a joint invasion of Poland by Nazi Germany, the Soviet Union, the Free City of Danzig, and a small Slovak contingent, that marked the beginning of World War II.
Relevant evidence: Yes