sentences:  He was assigned command of the First Military District, which encompassed St. Louis and the surrounding county.In the early days of the American Civil War, General Frost supported the secessionist movement endorsed and led by Governor Claiborne Fox Jackson.In February 1861 Frost enrolled the members of the pro-secession Minutemen para-military organization as Companies in a new Second Regiment, MVM (despite Missouri's "official" policy of neutrality).