Ok I tested it myself...
Modded the Cilicians to have 63 in defensive ability. They are most likely the best since they have low mass, no armour and no shield.
I put them into a deep square formation about two times deeper than wide and presented teh side to the Companions. The charge went very badly for the Companions, they killed only 3 men, but then again I had noticed that the entire line of men on the left flank had turned to face them. So when they pulled back to retry the charge I made my Cilicians (who had lost 8 men to the 27 Companions) march perpendicular to the Companions to force them to present the left flank. This time the Companions killed 56 men in the charge, and my unit routed instantly there after.
Now I have heard that men marching won't recieve a charge as well as those standing still, so that might have impacted the result.
I tried it again and the results were the same, if the Cilicians faced the Companions they were pushed back and the Companions penetrated the unit but killed less than a hand of men. Marching made my Cilicians die like flies.
Obviously the defensive ability doesn't add much to the left. Now I will try marching with the right side presented.
[EDIT]
Hmmm... The test was inconclusive. The Companions could indeed penetrate the right side as well, but were far from as good at it as the left. But if my men were marching they got killed very badly, in one case I lost every single man and the Companions lost 1 single rider. Standing still the Cilicians were a veritable wall, but against the men on the right flank turned to face the enemy. So the results are impossible to understand, only that you should never march with your side to enemy cavalry, your men can't stand up to a charge at all.
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