Dunkirk - (May 26, 1940) The Battle of Dunkirk was the defense and evacuation of British and other allied troops. This was the moment in the war where the best of France's and British's armies/troops were cornered and surrounded. They were being evacuated to the UK, even with the help of civilian boats.
D-Day - (June 6, 1944) Also known as the Normandy landings or Operation Neptune, was the landing operation of allied troops during Operation Overlord. It was also one of the largest seaborne invasions in history. Allied troops stormed the beach up to the German-controlled bunkers and secured them through great effort with a huge lost of life.
Pearl Harbor - (December 7, 1941) The Attack of Pearl Harbor, included the surprise attack of Japanese naval bombers and other aircraft on the Pacific fleet that was stationed at Pearl Harbor. The Japanese planned on crippling the United States aircraft carriers but luckily weren't stationed on the day of the attack, but in the attack the United States lost 4 battleships, and 4 others badly damaged, 3 cruisers badly damaged, 1 tug-boat sunk, and numerous aircraft destroyed and damaged. This event led to the United States entering the war.
VE Day - (May 8, 1945) VE Day, also known as Victory in Europe Day, marks the formal acceptance by the Allied powers of Nazi Germany's surrender of its army.