Casino War - House advantage

Play Casino War at Club USA Casino

The dealer and the player each have a 50% chance of winning, so this seems like an even money game. The house advantage, however, comes from what happens in the case of a tie.

Some casinos offer a bonus payout in the event of a tie after going to war.

The house advantage increases with the number of decks in play and decreases in casinos who offer a bonus payout. The house advantage for this game is usually over 2%

From Wikipedia's