So let's look at the individual games. First major battle of the Civil War, fought whilst both sides still expected the war to be decided by a single major engagement. Fairly low unit count with both sides suffering poor morale. The Confederates defend a river line. The Union forces launch a frontal assault, but this is just a faint, the real assault being an outflanking move which enters the map further West.
Victory depends on control of three victory hexes.
In this game, the Confederates need to seize three victory hexes from the, initially, outnumbered Union forces. Two Confederate columns enter from the N. East and N. West. Their army is the usual mixture of regular army, irregular militia and 'civilised' native american indians who are terrified of artillery. Pea Ridge was the largest Civil War battle fought West of the Mississippi river. Confederate morale is poor, but Union reinforcements enter only in dribs and drabs.