"Here on the afternoon of July 28, 1862, some 400 recruits and guerrillas from North Missouri led by Colonel Joseph C. Porter, C.S.A., ambushed 730 Union troops under Colonel Odon Guitar of the Ninth Missouri Cavalry. After several hours of fierce fighting, the Confederates were forced by superior firepower to retreat northward along Auxvasse Creek leaving 52 dead and more than 100 wounded. Union losses were 13 killed and 55 wounded. This action prevented Porter and his men from crossing the Missouri River to join the Confederate forces in Arkansas. Many of the casualties are buried in a mass grave on the south side of the road about one mile west of Calwood."