Shortly after the start of the war, Sigel was commissioned colonel of the 3rd Missouri Infantry, a commission dating from May 4, 1861. He recruited and organized an expedition to southwest Missouri, and subsequently fought the Battle of Carthage, where a force of pro-Confederate Missouri militia handed him a setback in a strategically insignificant fight. However, Sigel's defeat did help spark recruitment for the Missouri State Guard and local Confederate forces. Sigel later took part in a skirmish at Dug Springs.