[Jack_Trowell]

You can put your devils at the back, and give them orders to hold and attack rear, this way they will wait 2 turns, letting your opponent battle line disperse while advancing, and when they attack they should have a better impact.

You let some times for spells and arrows of the ennemy, but with the longer range from starting at the back of your own battle line, you should me mostly safe.

This can also works very well as support for your main army : your heavy infantry will hold the main ennemy units, preventing while your demons will attack his archers or flank the main unit.