
Your objective is to break through the enemy forces and get your fighters into the enemy base. The actual combat units come in four different factional flavors: Winter Pact, Swarm of the East, Ironclad Union and Tribes of Shadowfen, with different emphasis on big units, swarms and more advanced strategies that involve multiple cards in concert or card abilities. Basically, if you have more soldiers on a square in front of or next to an opponent, you will destroy them.
Every turn, your troops will attempt to advance by defeating the enemy and each time you are successful your line will move forward. This line dictates where you can place new soldiers so it is important that you ensure that your line is as forward as possible. Obviously, while you are doing this your opponent will be doing the same as they try and advance to your base.