The Stonewall Attack is a chess opening; more specifically it is a variation of the Queen's Pawn Game. It is characterized by White playing 1. d4, 2. e3, 3. f4 and 4. c3, usually playing 5. Bd3 as well, even though the moves are not always played in that order (see transposition). The Stonewall is a system White sets up, rather than a specific variation.