Before being inactive from 2012 to 2019, it was known as the oldest rivalry west of the Mississippi River. First played in 1891, the Jayhawks and Tigers met on the gridiron every year after through 2011, with the lone exception being 1918 (flu epidemic). 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. Ironically, Columbia, Missouri, the location of the University of Missouri was also nearly raided by Quantrill's band. The name of the rivalry was officially rebranded as the "Border Showdown" in 2004 out of deference to those serving in the Iraq War, but the historical name continued to prevail in usage. Each year the winner of the game was awarded a traveling trophy, the Indian War Drum. Kansas lost the 120th and most recent Border War game to Missouri in 2011, 24–10.