Cowan moved to Washington in 1940. Denied the right to attend the press conferences of President Franklin D. Roosevelt. She appealed to Eleanor Roosevelt who then decided to hold her own press conferences with women reporters. In 1942 Cowan was sent to London to report on the Home Front in the Second World War. She then moved on to North Africa but after four months in Algeria she returned to England.
During the Normandy invasion Cowan reported from hospital ships caring for the Allied wounded. Later she interviewed several military leaders including Dwight D. Eisenhower, Omar Bradley and George Patton. Helen Thomas later commented to Cowan: "I think we have a special bond fighting the good fight for women in journalism. You were always a star to look up to. I still think that newswomen of that era were outstanding, unique and strong. We had to be."
In April 1945, Nash was reassigned to Associated Press bureau in Washington where she, and after the war she covered the Pentagon, the House Armed Services Committee, and general military news until she was forced to retire from AP in 1956, whose policy stated that women could not work after their 55th birthday. The compulsory retirement age for men at that time was 65.
Ruth married Bradley D. Nash, an aide to President Eisenhower, in 1956, They moved together to Harper's Ferry, West Virginia, where they owned High Acres Farm. Nash used her retirement to continue writing, this time working on her memoir about her experiences during the war. Her manuscript, titled Why Go to War?, was never published.
Ruth Cowan died on 5th February, 1993.
Two fighters escorted us toward French fields neat and green, and we landed sharply on a strip laid down by detachments of this same transport group.
We were approached at once by soldiers curious about the new arrivals. They were tired and grim, saying little at first, yet wanting to talk. Their field uniforms were dusty, but they had found time to shave. They watched and listened as you wrote one man's name and experiences in a notebook.
"Will the story be in my hometown paper?" was the closest any of them came to asking anything outright. They asked that because it is a way of letting the homefolk know they are safe.
It was the same with both men and officers. Among them were seaman second class John Dolan, West Orange, New Jersey; Capt. Robert Mulligan, Capron, 111; and Warrant Officer Curtin Ferrell, Pontotoc, Mississippi.
Home things come first in their conversations with a woman correspondent, but they also are eager to know all about the flying bombs the Germans have been firing into southern England. Trucks come for the planes' loads and hurry off. Ambulances rumble up. Patients are quickly transferred to the planes-usually about 24 litters to each one - and the planes take off. It is not safe to linger.
Well-camouflaged is the tent of Major Milton Evans, Gulfport, Mississippi, Commander of Advance Headquarters, reached by crossing a clover field. You stay in the path resisting the temptation to pick beautiful red poppies. There is a dull boom-and dust thrown high on the beach shows why. Mines are still being found.