Eddy led the 9th Division in the early stages of Operation Overlord, codename for the Battle of Normandy, landing on Utah Beach four days after the D-Day landings of June 6, 1944. For his role in the capture of the French port of Cherbourg, Eddy was awarded the Distinguished Service Cross. In August, he became Commanding General of XII Corps, which was often the spearhead of Lieutenant General George S. Patton's Third United States Army. Eddy led XII Corps in the Allied advance from Paris to the Rhine and in the subsequent fighting on the Western Front. During the Battle of the Bulge, Eddy's XII Corps successfully held the southern shoulder of the German salient. In April 1945, after taking part in the Western Allied invasion of Germany, shortly before the end of World War II in Europe, Eddy returned to the United States due to a severe illness (extreme hypertension, from which he recovered) and was replaced in command of XII Corps by Major General Stafford LeRoy Irwin.