On June 6, 1944, Allied troops from the U.S., Britain, Canada and France, stormed the coastline of Normandy, France, taking the occupying Germans by surprise.
The D-Day Museum of Portsmouth, UK, has a large D-Day archive, including articles, veterans' memoirs, and audio clips.
Encyclopedia Britannica's multimedia guide is a terrific starting point for a school research project.
Notable clicks at this PBS site include the World War II European timeline, and the Special Features.
Don't miss the eight-minute video (on the front page) featuring the recollections of five D-Day veterans, and D-Day film footage.