حرب عصابات
Guerrilla warfare plagued Missouri from the start of the conflict in Missouri, but intensified in early 1862 as the weather warmed. To combat the growing guerrilla menace General Henry W. Halleck issued General Order Number 2 on March 13 which warned Missourians "warned that if they join any guerrilla band they will not, if captured, be treated as ordinary prisoners of war, but will be hung as robbers and murderers". Confederate President Jefferson Davis responded on April 21, 1862 attempting to legitimize guerrilla warfare by authorizing commissions for those forming bands of "partisan rangers". but this was not accepted by the United States authorities. On May 29 Brigadier General John Schofield responded with General Order No. 18 to the Missouri State Militia which read in part: