Annie,
I've just been reading through this long-legged thread again late this afternoon, and the irony of your question really caught my attention. "What in blazes happened?", you asked. A simple, smart-mouthed but accurate answer would be: "Blazes happened."
Of course, by that, I refer to all the towns and houses on both sides of the border that were burned. There were many. This is not meant to side track Leftyhunter's thread, but is a direct answer to your question. Osceola and Nevada, Missouri were burned out as thoroughly as was Lawrence, Kansas. I have no idea how many individual farms were destroyed in either state. Three and one-half counties in Missouri will forever be known as "The Burnt District". They were burned out by order of federal Gen. Ewing (acting as Jim Lane's puppet. That crazy order ruined loyal unionist and southern-leaning families alike. These stories are so bizarre and horrible that it's simply a case of the truth being stranger than fiction. You can't make this stuff up! You don't need to make it up because it really happened. My question after reading your very sincere and honest question is: How could anyone here be unaware of the war in Missouri and Kansas? But it's not your fault. There is way too much information out there for anyone to absorb, and most of it focuses east of the Mississippi.
However, returning to Leftyhunter's original intent for this thread: I concede that guerrilla warfare occurred to one degree or another all over the country. I think it left particular marks in Missouri that have not totally healed to this day, because for all but a few months of the war's timeline, guerrilla war was the only war the citizens of Missouri and Kansas experienced.