Annie Heloise Abel describes the 1862 Battle of Pea Ridge, a bloody disaster for the Confederates but a glorious moment for Colonel Stand Watie and his Cherokee Mounted Rifles. The Indians were soon enough swept by the war into a vortex of confusion and chaos. Abel makes clear that their participation in the conflict brought only devastation to Indian Territory. Born in England and educated in Kansas, Annie Heloise Abel (1873–1947) was a historical editor and writer of books dealing mainly with the trans-Mississippi West. They include The American Indian as Slaveholder and Secessionist (1915), also reprinted as a Bison Book. Abel's distinguished career is noted in an introduction by Theda Perdue, the author of Slavery and the Evolution of Cherokee Society (1979), and Michael D. Green, whose Politics of Indian Creek Government and Society in Crisis (1982) was published by the University of Nebraska Press.
I hope some of the later editions updated the wording and especially the formatting it definitely needs it. In terms of the content it is very dry however it provides a good amount of detail for the administrative and military actions for Kansas, Oklahoma, and Arkansas areas during the civil war. While it is definitely a very specific topic and can see how it would be rather useful for a larger study of the civil war especially if you intrested in things outside of the major battles.
Another book on how the First nations (Indians) were trick into fighting and mis-treated during the Civil War just to be swindle off their land for the railroad. Do not skip over the introduction!