Amanda W. replied:
Lincoln and Jefferson Davis face each other from the west and east of Kentucky, respectively, with the approximate location of Perryville between them. Perryville as the high-water mark of the Confederacy in the West represents the ultimate contest between the two nations in that state. Correspondingly, the Union Army's approach to that battle was from the (north)west and the Confederate army marched there from the (south)east.
Also, it is interesting that Lincoln is shown sitting and Davis standing. The body language of the former implies calm, determined, presiding possession, while the latter's posture communicates defiance and rebellion, rising up as if to leave the domain of the former.