While I was playing a stick empires game with someone, i did a trick with my units that helped me alot. These are things you can do with your unit's abilitys that will most likely help you win a battle when you and your enemy send your units to the middle.
This first one has to do with Spearton + Magikill, for better results, have a full line of speartons.
Have your speartons form a wall, then when the enemy is attacking, have them push back the enemy, this will stun the enemy for a few seconds, during the stun, have your magikill do his electric Wall. So while the enemy is stunned, they will be getting damaged by the electric wall.
Your enemy will try to run past your speartons if they decide to attack the magikill first, so make sure you have good timing.
That's the only tactic I have for now, I will try to do more later.