This was a Chaos only version of Mordheim that was an insert in an old issue of White Dwarf. It follows the same rules as the Skirmish rules in the back of the 6th? edition rulebook. Whichever one it is I have an extra one somewhere.
But I thought that since a couple of you are making some Chaos Warbands it might provide some other options.
Don't remember if the older rulebook had the experience tables and such in it, but it had the rules for fighting, shooting, etc.
I thought the Path to Glory had a pdf on the GW sight, but not sure.