Enrolled Missouri Militia
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The Enrolled Missouri Militia was a state militia organization of Missouri in 1862 during the American Civil War. It was a part-time force whose primary purpose was to serve as garrison and infrastructure guards, both to augment the Unionist Missouri State Militia in defense versus raids and to free the Missouri State Militia for offensive operations versus Confederate guerrillas and recruiters.

https://en.wikipedia.org/wiki/Enrolled_Missouri_Militia