The 9th Wisconsin Infantry was organized at Camp Sigel, in Milwaukee, mustered into service on October 26, 1861, and left for Fort Leavenworth, Kansas, on January 22, 1862. From there it marched to Fort Scott, Kansas, conducted expeditions on the southern plains, and then moved through Missouri and Arkansas.

It participated in the Battle of Prairie Grove, Arkansas. The regiment mustered out of active service on January 30, 1866. It lost 191 men during service. Seventy-seven enlisted men were killed and 114 enlisted men died from disease.

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[Source: Estabrook, Charles E, ed. Records and sketches of military organizations... (Madison, 1914?)]