David, I picked up Schlieffen Plan the other day and have already played a few turns. I am impressed by your design and eagrely await follow on games. I do have some comments that might interest you and others contemplating a purchase. The map is very colorful the use of hexside terrain is unique.
Units lose strength incrementally from combat.
Many fortess counters are included to reflect the state of field works in use at the time. The sequence of play is simple and straightforward. Reinforcements, movement, combat, and replacement are completed in order for each side. Combat is conducted by totaling one's attacking strength point total and rolling under that amount inflicting a numerical loss on the defender. Terrain can modify the attack roll.