Attack rearmost - how does it really work?

[thejeff]

I don't think its Zones of Control. I've seen small groups move down the side, then make a sharp turn and close almost to the center to reach a target.

I've also seen larger groups have one flank get involved in a fight when they come in contact with the enemy, while the rest of the group continues towards the rear.

Does the debug log shed any light on this? I've never checked.