[MaxWilson]

My understanding is that for RP reasons (it's considered unlikely that a friendly unit will be able to spot the very rearmost enemy way at the back), the actual target selected is *toward* the rear but not necessarily at the very back. My impression is that more enemies toward the back increases the likelihood of them being targetted, so it's probably something like "3% chance of being targetted, for every unit starting at the very rearmost, until one is selected."

Occasionally it is very effective. Usually against me, when I forget to give my mages bodyguards, and the enemy cavalry skirts my main formation and then, upon reaching the back, charges right at my mages. Sigh.

-Max