Invasion 3 - another cool battlefield warfare game. Start a new game, then click on the names of a few units to purchase them for your army. When you think you are about ready, start the game! You will be on the battlefield. Click on the names of the units in the deployment bar at the bottom of the screen to send out one of them to confront the enemy castle. You win a level by reducing the castle to a flaming pile of rubble.