Born 23 Aug 1837 in Hol, Buskerud, Norway. Civil War: Post war: Moved to Beloit, Wisconsin. An obituary for Gilbertson’s father, Ole [Gudbrandson] Gilbertson, published in Northwood Index, Northwood, Iowa, states that three sons, Gilbert Gilbertson, Nels Gilbertson and Iver Gilbert, all served in the Civil War: Private. Nels Gilbertson may have used the name Niels Olson. Sources: (Letter, Mrs. Earl Wold, Brooklyn Park, Minnesota)