<human>:  I have a question about a book I’m reading. It’s called D-Day: 50 Years On. When did D-Day happen?
<bot>: D-Day was the code name for the Allied invasion of Normandy on June 6, 1944. The invasion was a major turning point in World War II, and it was the largest amphibious invasion in history. The Allied forces landed on the beaches of Normandy, France, and quickly advanced inland. The invasion was a success, and the Allies were able to push the Germans back and liberate France.