Macedonians pass through each other freely; most Persians must roll to interpenetrate.
How it works
All Macedonian units can move through each other. Persian light troops can pass through any friends, but other Persian units moving through each other roll a d6 and fail on 1-3; they may complete the move next turn without rolling again.
other Persian troops who try to move through each other must roll a dice – if the score is 1,2 or 3 the two units fail to complete this difficult manoeuvre.