The 4th Regiment KSM was from Jefferson County, which bordered the northeast corner of Shawnee County. Under the command of Colonel William McCain, the 4th was part of the Army of the Border spread out along the Big Blue River on 22 October, 1864. Sometime that afternoon, Col. McCain ordered a small party of 20 or so men south towards Hickman's Mills in an attempt to make contact with the rest of the Army. The party was surprised by pickets from Jackman's Brigade and taken prisoner, with the exception of Aaron Cook of Co. B. Richard J. Hinton writes in his book "Rebel Invasion of Missouri and Kansas...1864":
An interesting by-product of my research into the 4th KSM is that I discovered that I am related by marriage to Aaron Cook. My GG Grandfather, John F. Bell of Co. D, had a younger sister named Margaret. Her daughter Julia married George Cook, the son of Aaron Cook about twenty years after he was killed by the Confederates near Byrom's Ford.