Battle cards affect gameplay by determining the following:
During setup, after the 6'x3' battlefield has been established and the obstacles have been placed, three random Battle Cards will be revealed from each category—objective, deployment, and condition.
Then starting with the first player, players alternate eliminating mission cards until one of each type remains. Once both players have had two chances to eliminate battle cards, the leftmost cards from each category are selected as the objective, deployment, and condition cards that will be used during your game.
See the following pages for all of each type of battle card: