Defend your fortress from the oncoming enemy waves. Place turrets in locations of your choice on your fortress, creating the best defense possible to withhold even the greatest of attacks.
To Protect the Earth from alien invasion, you're given a ship class AT-021. But unfortunately the Earth doesn't have enough resources to supply new arms to the ship. Improve the ship by collecting weapons through battles and buy turrets to defend.
Defend the space carrier with a turret by gunning down as many enemy spaceships as possible. Get additional help by sending out carrier fighters of your own.
Choose your army and select your towers to attack incoming enemies. Use good strategy to defend against Trojan armies otherwise you have to face defeat. War is on!