Attack rearmost - how does it really work?

[Lingchih]

I've generally had good results with attack rearmost with Hector and his elephants (if you couple them with a powerful attack force in the front), and with insane flying units, like a Gorgon. Hector generally bypasses indie front line troops and does attack the commanders in the rear, and a Gorgon seems to think front line troops are not worth the trouble, and immediately hits the rear. Other units... meh. They might attack anything on the way.