Build a lot of guard towers around your town. Keep your hero in the back of the town for protection. Have a large amount of warriors; keep half of them in your village and send the others to destroy your enemy's village.
Get a lot of workers in groups of four to quickly build and fully upgrade lots of towers around the outer edge of your camp. As you advance, build more towers and tear down the old ones to get half the materials back for reuse. This will give you more time to harvest and upgrade other buildings without having to buy a large army.
Send Archers, Catapults and Birds to do most of the work. Have them stay far enough away; they can take out enemy towers and other buildings undetected. This requires more time because only a few of those units can gather without being detected.