Defend your base from the invading enemies. Defeat the enemies by placing soldiers along the way to stop them from reaching your base. Carefully place your units on the map and upgrade them for better fire powers. Click and drag the soldier icon to place it on the field to defend your base. Earn money by defeating enemy soldiers. At the end of the level, store your best soldiers to keep them for the next round. Upgrade your army between levels with the stars you earn from victory.