This Week on History Happy Hour: He never became as celebrated as his fellow commanders George Patton and Omar Bradley, but General William Simpson, commander of the 9th U.S. Army in WWII, built a superb combat record. General Dwight Eisenhower called him brilliant, adding: "If Simpson ever made a mistake as an Army Commander, it never came to my attention."

To explore his WWII command record, Chris and Rick will be joined by William Stuart Nance, author of a new book about Simpson and his Chief of Staff James Moore: Commanding Professionalism: Simpson, Moore, and the Ninth US Army.

William Stuart Nance is a retired armor officer. He taught history at the United States Military Academy and the United States Command and General Staff College. He is the author of Sabers through the Reich: World War II Corps Cavalry from Normandy to the Elbe.