BattleLine is the american version of Schotten Totten, both games created by Reiner Knizia.
Players fight one against the other with a 60 cards deck made of 6 colors, with 10 cards in each.
Each player has 7 cards in hand and, on his turn, plays a card in front of one of the 9 stones.
Each player must, theoretically, play 3 cards at all in front of each stone, and the best formation wins the stone.
The first player who wins 5 stones, or 3 neighbouring ones, wins the battle.