The borderlands of Kansas and Missouri were battlegrounds for insurgents during the American Civil War, with raids going back and forth across the border. Bates County is noted as the site for the first combat engagement during the war of African-American soldiers serving with the Union and against Confederate forces, which occurred on October 28–29, 1862. The First Kansas Colored Division (part of the state militia) fought Confederate guerrillas at the Battle of Island Mound four miles north of present-day Rich Hill, Missouri, and the Union forces won.