It is pretty much like in AOK:
some facts (well actually these depend on patrol stances as well but simplified):
-A champion beats a arbalest 1v1
-Open ground: 20 champions beat 20 arbalest
-Open ground: 40 champions beat 40 arbalest
But
real battle ground with buildings in the way
-20 arbalest beat 20 champions
Moreover
real battle ground with buildings, elevations and 5 light cav shielding the archers
-30 arbalest (and a few light cav) OWN 40 champions
Same in AOM, toxotes and throwing axers die to say hoplites, but they wont once massed in a game.
If u test it 30 ulfsark probably beat 30 toxotes on open ground, but they wont beat 10 holites and 20 toxotes, or toxotes hiding behind a shallow piece of the map....