November. November 4 – World War II: U.S. President Franklin D. Roosevelt orders the United States Customs Service to implement the Neutrality Act of 1939, allowing cash-and-carry purchases of weapons to non-belligerent nations.

On September 1, 1939, German forces under the control of Adolf Hitler bombard Poland on land and from the air. World War II had begun.

Hitler’s invasion of Poland in September 1939 drove Great Britain and France to declare war on Germany, marking the beginning of World War II. Over the next six years, the conflict would take more lives and destroy more land and property around the globe than any previous war.

A British policy paper issued by the British government in May 1939, following suppression of the Arab Revolt of 1936-1939, stating the British objective of establishing an “independent Palestine State” bound to Britain and encompassing both Jews and Arabs.

25 August – 1939 Coventry bombing: An Irish Republican Army bomb explodes in Coventry, killing 5 and injuring 70. 30 August – Royal Navy proceeds to war stations. “Operation Pied Piper”: 4-day evacuation of children from London and other major U.K. cities begins. Blackout imposed across Britain.

Common Era

June 7, 1939 (Wednesday) The German–Latvian Non-Aggression Pact and German–Estonian Non-Aggression Pact were signed in Berlin. King George VI and Queen Elizabeth crossed the Canada–US border into the United States at Niagara Falls.

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On 3 September 1939, Britain and France, which were allied with Poland, declared war on Germany. The Poles contributed greatly to the Allied war effort and the Polish Air Force pilots played a conspicuous role in the Battle of Britain and the Polish army formed in Britain later fought during Operation Overlord.

The British Military Mission to Poland was an effort by Britain to aid the nascent Second Polish Republic after it achieved its independence in November, 1918, at the end of the First World War. General Carton De Wiart also headed the British Military Mission to Poland in 1939.

The Soviets invaded Poland on 17 September….Invasion of Poland.

List of armed conflicts involving Poland against Russia

Piłsudski believed that the best way for Poland to secure favorable borders was by military action and that he could easily defeat the Red Army forces. In the wake of the eastward Polish advance that followed, the Soviets sued for peace, and the war ended with a ceasefire on 18 October 1920.

The Soviet invasion of Poland was a military operation by the Soviet Union without a formal declaration of war. On 17 September 1939, the Soviet Union invaded Poland from the east, sixteen days after Germany invaded Poland from the west.