Douglas Campbell, the first American-trained World War I pilot to be called an ace for shooting down five enemy planes, has died of respiratory failure at age 94.

Campbell, who died Tuesday at his Greenwich home, shot down six German planes over France during April, May and June of 1918. His exploits are recounted in the 1984 book "Let's Go Where The Action Is: The Wartime Experiences of Douglas Campbell," by Jack Eder.The French made him a Chevalier of the Legion of Honor and awarded him the Croix de Guerre with three palms.

Campbell is survived by his wife, Virginia Pope Campbell, two daughters, four sons, 12 grandchildren and three great-grandchildren.