The world is being taken over by an unknown threat. Fight back against the enemies by building bases around the world and eliminating the enemy headquarters one base at a time. Use your mouse to start by building a power station, and then build a refinery, and a barracks. After that, start sending out trucks to gather more resources so that you can build enough infantry to lead a full frontal assault. Once you have taken down one headquarters then move onto the next location and use the skills you have learned to take on the bigger enemy bases. Continue to battle across the world until you have taken back your land.