1) In September 1939, Germany invaded Poland using blitzkrieg tactics of air strikes and fast-moving tanks, capturing the country within weeks.
2) The Soviet Union then annexed parts of eastern Poland and the Baltic states of Lithuania, Latvia and Estonia. Finland resisted but was eventually forced to surrender after being outnumbered.
3) In 1940, Germany launched surprise attacks on Denmark, Norway, Holland, Belgium and France, quickly defeating them and surrounding the Allied forces in Dunkirk, from which 338,000 British and French troops were evacuated by sea.