To operate the cannons on the German side, click on the arrows to change direction, distance/power, and press the red button to fire. It is the year 1917. The U.S. have sent the American Expeditionary Forces to aid the Allies and try to break the stalemate. The Central Powers (mainly Germany) have set up artillery behind the trenches. Be careful in no-man's land; you'll either get blown up or shot, and if your lucky, you might even find yourself in the enemy trench, against the whole enemy army!