[Saxon]

Ah, you are all being too hard on yourselves. Clearly, given the vacuum of information regarding the commander of the heavy cavalry force, this is where the answer is. Put your fully equipped Wraith Lord in charge of the cavalry, then deploy the cavalry as an honor guard…

More seriously, I would add one thing to the discussion. I agree that this is possible, but that it is not a sure thing. I thinking having one or two troops in the center to hold the enemy troops is a good idea. But, the closer the troops running to the back are to enemy, the higher the chance they will turn and attack. As such, I would argue for splitting the cav into two troops of five and putting each of them at the front, at the extreme left and right. Hopefully, the enemy will move en masse to attack one of the two groups, leaving the other a straight run at the mages in the back. It would also increase the distance between the enemy and those running to the back. Often, the troop with the run at the back will turn and attack the main body of troops, but on those occasions they head straight to the mages is nice.