By checking the Missouri State Archives website, you can easily get a list of those who served in the 8th Missouri, especially in Company E. I have found a larger portion of the 8th Missouri were drawn from Phelps, Dent, Texas and Crawford counties.
Green Berry and George Harris both joined on 8/5/1862 in Thomasville. They fought at the Battle of Prairie Grove and literally opposed the 1st Arkansas Cavalry at one point (P.P.Brown of course was part of the unit at that time, he later would be made the head cook at Fayetteville, Arkansas and was specially detached). I have little information about George but Green Berry set up a farm above Gourd Creek Cave near Vida, Missouri in Phelps County before the war. His son, James William Harris,after the war married P.P. Brown's daughter,Sarah Levinia Brown, in September 1868. After the war, P.P. Brown settled next to G.B. Harris' place, buying a large section of land there. G.B. "Uncle Berry" Harris and his wife, Mary "Aunt Polly" are buried in Huskey cemetery, about 1/2 mile from their farm. P.P. Brown and his first and third wife are buried in the St. James Cemetery.
James W. Harris was born Oct. 20, 1847 in Indiana and died July 26, 1935 in Phelps County. Sarah Levinia Harris was born December 14, 1851/3 in Phelps/Texas County and died February 27, 1919 in Phelps County. James and Sarah are both buried in Corn Creek Cemetery but her middle initial is wrong as well as the dates of birth.
I don't know of any Andrews in my family.