In this elaborate defense game you have to build all sorts of trenches, pillboxes and anti-tank machinery to hold of various waves of hostile attacks from your base. Select the means of defense you want to use place it behind your line, rotate it and then put soldiers in it. There are also upgrade and repair options. When you are done building a fortress, click on the 'Ready' button. Good luck!
Use WASD to move. Press Q and E to switch between soldiers or turrets and G and F to switch between weapons. Press Space to control single units. You can Change the controls in the 'Options' menu.