U.S. President Franklin D. Roosevelt receives a letter from Albert Einstein, urging the development of atomic weapons in response to potential Nazi nuclear ambitions. This moment sparks the beginning of the Manhattan Project. The British Expeditionary Force (BEF), which had been steadily deploying troops into France, reached a significant strength of around 158,000 soldiers. Germany’s preparations on the Western Front suggested that a large-scale offensive against France and the Low Countries was inevitable.
WW2 Day by Day - The Ultimate History of Second World War
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