How do i know what the "engagementr range" is and yes I have noticed some units (having chased enemy and routed them) return approximately to where they started but not exactly. also a key phrase seems to be "rather than forming up around their leader's current location." which seems to indicate that if you dont have hold psotiion on then units will return wherever the leader is.

I gues the command i realy want is "rally" (not the one we have for routed units) but a kind of recall command which would halt units and return them to a position (without a penalty)unless of course they realy were were retreating rather than regrouping. Difficult to programme or what.