Jacob Olsen
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| Name at Enlist | Jacob Olsen |
| Birth Name | Jacob Olsen |
| Other Names | Olson |
| Lived | 1830 – 27 Nov 1897 |
| Resident of Muster-In | Freeborn County, MN |
| Company at Enlistment | K |
| Rank at Enlistment | Private |
| Muster Date | 11 Feb 1862 |
| Death Location | Sioux Falls, Minnehaha County, SD |
| Burial Location | Prairie Queen Cemetery, Summit, Roberts County, SD, lot 46, block 2, grave 1 |
| Spouse | Anna Hansdatter |
| Spouse Lived | -1870 |
| 2nd Spouse | Oline Thomasdatter Helgerson |
| 2nd Marriage Date | 17 Nov 1871 |
| 2nd Marriage Location | Freeborn County, MN |
Jacob Olson was born about 1830. He joined the WI 15th Infantry, Company K. The company called itself “Clausen’s Guards” in honor of the 15th’s first Chaplain, Claus L. Clausen. Most of the company was recruited from Scandinavian communities in MN and IA, with the rest from WI.
The army listed him as living in Freeborn County, MN, age 31, and married. His wife was Anna Hansdatter and they had four children together. Olsen enlisted for three years on December 10, 1861 in Freeborn County, and mustered at Madison, WI on February 11, 1862 as a Private (Menig). On June 11, 1862, he became sick at Mississippi River Island No. 10. A few months letter, he became unfit for service and was discharged for disability on August 16, 1862. After the war, he and Anna had a fifth child. Anna died about 1870, and Jacob married again on November 17, 1871 in Freeborn County to Oline Thomasdatter Helgerson, the widow of Peder Helgeson. Helgeson had served with Jacob in Company K. Jacob died on November 27, 1897 at Sioux Falls, SD. He was buried in Prairie Queen Cemetery, Summit, SD, lot 46, block 2, grave 1.
Sources: Series 1200: Records of Civil War Regiments, 1861-1900, Wisconsin Adjutant General’s Office, box 76-12; Det Femtende Regiment, Wisconsin Frivillage [The Fifteenth Regiment, Wisconsin Volunteers], Ole A. Buslett (Decorah, Iowa, 1895), p.637; Nordmaendene i Amerika, Martin Ulvestad, 1907, History Book Co., Minneapolis, MN, p.317; Oberst Heg og hans Gutter, Waldemar Ager, 1916, Fremad Publ. Co., Eau Claire, WI, p.318; SDSHS WPA Veterans Cemetery Records, Lake County.