It was the opening gambit of World War Two in Europe. After trying to press its geographical claims (especially to the Danzing corridor) through political means, Hitler decided to go ahead with an invasion of Poland.
Two weeks later, in accordance with the provision of a secret agreement between Nazi Germany and Soviet Russia, Stalin’s forces invaded Poland from the east, and within a month, the nation was conquered entirely, and partitioned between the two invaders.
But the war wasn’t over. Poland had allies – France, Britain and Britain’s Empire all declared war on Germany on September 3. World War Two had begun in Europe.