"Civil War Arkansas 1863: The Battle for a State" by Mark K. Christ.
http://www.amazon.com/Civil-War-Arkansas-1863-Battle/dp/0806140879/ref=sr_1_1?ie=UTF8&s=books&qid=1254928176&sr=1-1
Much like Shea's PG campaign book is the anticipated title of '09, this one will likely do it for 2010!