In any normal war, capturing an enemy capital would capture the imagination of soldiers and the public back home. During World War II, capturing the capital of one of the original members of the Axis Pact should have been a defining moment. That moment was overshadowed by another defining moment: D-Day, the amphibious invasion of Nazi-occupied Europe.   When the Allies captured Rome on June 4, 1944, however, the city was open because most of the fighting had taken place along the way – and the...