Battlefield Atlas of Price’s Missouri Expedition of 1864 is intended to serve as an educational reference for the Westport and Mine Creek staff rides. The Atlas is divided into seven parts. Part I, Missouri’s Divided Loyalties, and Part II, Missouri’s Five Seasons, provide an overview of Missouri’s history from the initial settlement of the Louisiana Purchase Territories through the opening years of the American Civil War. The remaining parts cover the Confederate plan, the Confederate movement into Missouri and the Union reaction, the Confederate retreat and Union pursuit into Kansas, and the final Confederate escape back into Arkansas. The atlas has a standard format with the map on the left and the narrative on the right. Each narrative closes with two or more primary source vignettes. These vignettes provide an overview of the events shown on the map and discussed in the narrative from the perspective of persons who participated in the events. In most cases there are two vignettes with the first from a person loyal to the Union and the second from a person who supported the Southern cause. A few narratives have two or more vignettes from only the Union side. This was done to emphasize disagreements and struggles among senior leaders to establish a common course of action. Map 25, Decision at the Little Blue River, is a good example and the three vignettes emphasize the disagreement between Maj. Gen. Samuel Curtis and his subordinate, Maj. Gen. James Blunt on where to locate the Union defensive line.