I'm looking for a good history of this campaign. I've tended to overlook it in favor of the usual 1862-1863 battles, but there seems to have been a number of comparatively open fights on the open flank with the various attempts to cut the CSA railroads. I recently realized that Grant didn't have overwhelming numbers during the period that Sheridan was operating in the Shenandoah, yet still kept pressure up. Once Sheridan returned with VI Corps and the cavalry, the writing was on the wall.
A good history available on Kindle would be the absolute best, but I'll pitch something from my shelves to make room for an actual book.