And Continually Wear the Blue (1989)

Sub-titled "A Short Guide to the U.S. Army & the 'Indian Wars' 1850-90." This rules booklet extensively details the unit organizations for the U.S. Army forces during the period covered, as well as some of the opposing Native American contingents. There are several scenarios included, with even a mini-campaign, for those inclined to conduct such. It is 64 pages in length.