Re:retreat in a 'diagonal' 4 player game
garion (#29954),
Well, there is no concept of "enemy territory" other than "hexes with actual enemy units in them".
Retreats are still affected by hexside limits, though, which is a big deal. Generally, between the typically constrained terrain and the need to keep forces together (both because you need flunkies to screen your valuable units, and because individual units can be easily "soaked off" with cheap pinning attacks by the first player), it's just not that big a deal.
And don't forget too that the winner can "regroup", which is both a reinforcement and virtually an exploit - and not bound by hex limits. You'll generally be much better off by winning battles and regrouping forward than by retreating from losing battles in an infiltration-type maneuver.
All these things help to make the game much more fluid than you might expect, which to me is a very good thing. The game has improved in my estimation greatly since I started playing the retreats/regroups properly, although they do take a bit to get your head around.