The Robert Lincoln O'Connell papers document the service of an Irish-American soldier who served as a combat engineer in the First Division of the American Expeditionary Force (A.E.F.) in World War I, 1917-1919. The digitized papers include correspondence he wrote to his family during his service and include items such as passes, orders, publications, postcards, and photographs. There are also some materials, like copies of federal census forms and his 1972 obituary, gathered recently by family members and Archives staff to supplement the collection.