The army of darkness are advancing. The whole world would be in trouble if you let them pass through. Luckily for you, you gathered enough warriors to fight them. This would be ugly, but nothing would be left if they are able to reach the people of the land. The idea here is defense. You need to put a soldier to where the enemies would attack. Each area you defended, you would earn some gold and you can use the gold to buy other type of soldiers. The game would be harder as you make some progress.