Massive War

In this strategy you choose one of three sides and then you conquer the world. You can handle ground, air and sea troops. For the won battle you get points which can be put into improvements. Those are damage, health, armor, speed and many other things. After winning enough battles you get better units. Sometimes you battle only with ground units or air, it really depends on the type of map. Oh and I have almost forgotten, you can built defensive structures too.