I don't know Mordheim. are these the same rules as warhammer battle? As I refered to the Great Battle of History series it was mainly because each unit is characterized by its quality, type (with a lot of subdivision) and also because of the low magic level which could easily be included as home rules.
You have units for light units (slingers, or guys with bows, javelins or whatever), medium unit, heavy infantry unit, the same for cavalry, plus war elephants and war charriots depending on the regions (Romans, Greeks, Celts, etc.).
Of course all these details would fit in the unit descriptions found in Conan RPG.