Most of Chaos armies are too strong to fight them 1:1 or 2:2 (or such victory will be very costly).
So of course to lure them in to traps when we fight 3:1 or 3:2 is only solution to get decisive victory. Or to get victory at all.
But in my game 40 units (2 armies) is everything what appears on battlefield at start. To make autoresolves in big battles it's like ruin all fun of game.
But for me it's only solution in such cases as this is part of my strategy.
Is there any way to put more units on battlefield at start? Or it's just blocked?