At the start, the Yorkist and Lancastrian forces are seen to marshall themselves in battle formation. Huge numbers of reinforcements generate a continuous melee in a small area, as a medieval battle, especially Towton (the bloodiest battle ever fought in Britain), would be like. When a leader dies, units may lose morale and flee the field, resulting in loss of battlefield integrity, but they may be rallied again.
The map and units are historically and geographically accurate.
The scenario is also good (ie balanced) as multiplayer (here the Lancastrians don't get monks).