Ole B. Berg was drafted into the U.S army and served as a private in France during World War One. He served in the battle in Argonne Forest and St. Mihiel and suffered "shell shock." He returned to Trondhjem, Minnesota Rice County in May of 1919.
Envelope addressed to Ole B. Berg at Camp Upton, New York. He was transferred to American Expeditionary Force, Postmaster New York; a two page letter, in Norwegian, from father, John O. Berg, Northfield, Minnesota; and three page letter, in Norwegian, from mother, Mrs. John O. Berg.