In skirmish when you are playing with Men or Elves, instead of building a fortress at the start of the game, build: a couple of farms, (a baracks if you are elves), (an archery range if you are men), and an armory. Now upgrade the armory to level 3 and purchase all upgrades, including fire arrows at archery range when playing Men. Now construct two battalions of archers, and fully upgrade them. Then what ever direction the enemies are coming from, build a well and a hero monument right next to each other, and place your archers just in front of them so they are getting leadership from both the well and the hero monument. Now your archers will be indestructable because the well will auto-heal them, and the hero monument will give them +50% damage and armor, plus they will gain experience twice as fast accelerating them to level 5 in no time. Now the enemy will be crushed whenever they attack!