Final comment: remember that there are several keys to battle.
(1) supporting fire -- When you attack, adjacent friendly units can join in and increase your firepower. Keep your units close together so they can offer support!
(2) limit defensive support -- Surrounding enemy units before attacking will cut them off from defensive benefits they can receive from nearby allies. The most effective way to do this is to place one of your units on each side of an enemy... but be careful that you don't leave your units vulnerable to counter-attack.
(3) terrain benefits -- Always take the high terrain if possible, and otherwise look for rough patches that will give better defensive position.
(4) patience is key -- Don't always attack with your first possible unit. Sometimes you should move several units into position to take advantage of points 1 and 2 before attacking to maximize the damage done and minimize your losses. Sometimes you are better off taking up a defensive position and letting the enemy come to you - especially if you can create a bottleneck or if the enemy units move at different speeds. (Of course, sometimes it's better to just go in guns ablaze. Use your judgment.)
ejamer
Nintendo Network ID: ejamer