You are referring to the entries on page 357-8 and 663 in the "Official Records" series 1, vol 8 which skims the surface of widespread violence in the Warrensburg area of Johnson County in March and April 1862. As a result of Captain James D. Thompson's (1st Iowa Cavalry) report on 30 March of numerous northern depredations in Johnson County, as well as southern guerrilla actions, and Confederate recruiter issues there (pages 357-8), the Union District of Central Missouri (on pages 663-4) on April 5, with the best of intentions, ordered Major W. M. G. Torrence of the 1st Iowa Cavalry to do a full investigation. Before Torrence could do much except hear the northern side of the story the roof caved in as his regiment, which had just been sent to west-central Missouri, and found itself in the middle of a large-scale Confederate recruiting drive in this same area. Various companies of the Iowans spread out over several counties were soon fighting for their lives. Their casualties would have been severe except they were dealing with untrained southern recruits. I seriously doubt Major Torrence got very far in his investigation. If you are able to locate the record of his investigation (which I suppose, if it survived, is kept on some microfilm in the National Archives and Records Administation), please, please share your finding with me. I have studied the personalities of these events for some time. I suppose you are already familiar with the 1860 Missouri Census reports of the Burgess households in Post Oak Township and Hazel Hill Township. If not, I will share.
I recommend you read these sources via interlibrary loan through your local library:
--Joseph K. Houts, "Quantrill's Thieves," Kansas City: Truman Publishing Co., 2002, pages 88-89 (regarding the family background and part of the career of guerrilla William MCown "Mack" Burgess;
--Ewing Cockrell, "History of Johnson County, Missouir, Topeka, Kansas: Historical Publishing Company, 1918, p. 112 (a rather balanced look at the violence at the Burgess household that day in the spring of 1862), (You should find an online copy of Ewing at http://archive.org/details/);
--State of Missouri, "Report of the Committee of the House of Representatives of the 22nd General Assembly of the State of Missouri Appointed to Investigate the Conduct and Management of the Militia," publ. in Jefferson City, 1864, and reprinted with an index by Dianne Buffton and Linda Brown-Kubisch, State Hist. Soc. of Missouri, Columbia, MO, 1998, pages 311-324 (concerning some revenge "Mack" Burgess and others took in July 1863);
--Bruce Nichols, "Guerrilla Warfare in Civil War Missouri, vol. I, 1862," Jefferson, North Carolina: McFarland and Company, 2004, pages, 89-91;
--Bruce Nichols, "Guerrilla Warfare in Civil War Missouri, vol. II, 1863, Jefferson, NC: McFarland and Company, 2007, 199, 202.
In essence, the Civil War began in earnest in Johnson County before the rest of the country got into it when one of the Foster brothers beat out James McCown in an election for county clerk and McCown shot Foster (I don't recall from reading if Foster survived his wound.) in the clerk's office in Warrensburg. I do not know details. McCown left town suddenly and later had a distinguished career as a colonel in the Confederate army. Apparently, McCown was related to the Burgess family. The Foster father and surviving brothers all entered service in the Union 7th Cavalry MSM then being formed partly in Johnson County, and Emory was named major, dad for a while was chaplain, and other brothers were captains. Naturally, they took a strong interest in the McCown and Burgess families with the results you probably already know.
There is much more to this that would take more time and space that I have today, so I refer you to the above sources. I am sure I will think of more sources later, but that will get you well into this.
Bruce Nichols