Battle
You can shoot your cannon every five seconds. You must adjust for the wind, then set the proper angle and shoot. Try to hit the opposing hero to get more coins. Shoot down the enemy dragon, soldiers, orcs, etc. with your cannon or other defensive units. Send some cannons out as your enemy will try to destroy them first and thus will save you a few cannonballs. If you have an Orc at your castle's door, send a Soldier to kill it. Orcs, Cannoneers, and Bombers are used against castles themselves. The wind changes at random times. Watch the flag to judge the power of the wind. The best way to shoot is to keep the aim bar at about three quarters. If you can hit a specific enemy room enough times, you will completely destroy it. If one of your own rooms is in danger of destruction, quickly repair it.
Layout
Start by purchasing the top option in the Wizardry section. This room gives you more money. Also upgrade it frequently. Protect your castle with beams, but do not place them in front of your cannon. Position them in the top section of the castle for best results. Also place a beam at the base of your castle to add protection against incoming orcs and low-placed shots. Save 300 coins to purchase the dragon. It does a lot of damage.
Power-ups
Although it costs 50 coins, shooting the Missile will result in a guaranteed hit on the closest enemy unit. Sabotage only lasts for twenty seconds, but it completely stops an enemy room from working. The Fireball cannonball is the best choice for causing some extra damage. The Split cannonball is best used against dragons or a lot of incoming units.