You have no backup army behind you or no soldiers to help you. So, you will need to be accurate in killing your enemies. There are various levels of the game and you will find the next stage more difficult than the previous one as the game advances. The game might not be full of fighting but with the progress, you will be facing more enemies with tanks and choppers. So, the game is surely going to test the accuracy and perfection of the gamer. As you will be defending a wall, your target will be to prevent enemies from destroying it. Try to destroy the tanks first as these do more damage to the wall.