Increase troop size
This is something that I've wondered at start. I've seen screens full of soldiers and when it came down to my very own, I had to fight with just a couple of warriors. Once I leveled up again and again I saw that the number of troops we can dispatch keeps increasing. So if you want to have a lot of soldiers and outnumber the enemy (which you should do if possible) keep leveling up and unlock the slots to send more fighters.