On May 17th, 1944, Gen Dwight D Eisenhower, the Supreme Commander of the Allied forces, and later US president, flew into the air- field at Greencastle. Photograph: Courtesy of the Imperial War Museum, London When President Biden stood at the grave of his ancestor at the tip of the Cooley Peninsula, he was little more than a kilometre away from an area associated with another US president. On May 17th, 1944, Gen Dwight D Eisenhower, the Supreme Commander of the Allied forces, and later US president, flew into the airfield at Greencastle. It was just across the water at the...