 The annual game was known as the "Border War," which derived its name from actual warfare that occurred during the Civil War between free-state "Jayhawkers" and pro-slavery "Bushwhackers" from Missouri.Six towns, including Osceola, Missouri, were pillaged and raided by the Jayhawkers.In retaliation, William Quantrill and his band of Bushwhackers burned Lawrence to the ground in what became known as the Lawrence Massacre.