Unknown Attack - Version 4.9 In this game you have to protect the territory of your artillery base from unidentifiedattackers. As you progress, the pressure will grow as new species of invaders come at you. However, Allied boats, weapons and improvementbonuses will help you. The main task is to hold out against all enemy attacks as long as possible.In this game you have to protect the territory of your artillery base from unidentifiedattackers. As you progress, the pressure will grow as new species of invaders come at you. However, Allied boats, weapons and improvementbonuses will help you. The main task is to hold out against all enemy attacks as long as possible.In this game you have to protect the territory of your artillery base from unidentifiedattackers. As you progress, the pressure will grow as new species of invaders come at you. However, Allied boats, weapons and improvementbonuses will help you. The main task is to hold out against all enemy attacks as long as possible.