[Graeme Dice]

Originally posted by Zen:
There is also a % that units will actually be able to fire at the 'rearmost' and not 'mostly rear'.

This isn't quite correct. According to the devs, there's a chance that a unit will pick the most rearmost squad. If this chance fails then the next closest squad is checked, then the next, and so on.

So while putting your commanders as the rearmost may seem like a good idea, it is in practice not. Unless you want to take the chance that a flier or archer to actually target the rear.

It could also be that his commander was one of the only mounted units, or units with a size greater than 23 on the battlefield, which would make him a candidate for both 'target largest', and 'target cavalry'.