I do not know if you are still trying to follow up with the man killed in the Humansville cemetery in Polk county but on Aug. 10, 1863, My GG grandfather Hugh Franklin Brown was killed by raiders on the Lawrence county border just south of Ash Grove. They say the bushwackers were called the Hersbergers or something similar. Since Humansville is not that far by horse, it is very possible it was the same group. My G grandfather was just an infant when his father was killed out fixing a fence. It could be a likely conjecture.