Stonewall Attack

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. If White puts up the Stonewall formation it is called a Stonewall regardless of how Black chooses to defend against it. When Black sets up a Stonewall formation, with pawns on c6, d5, e6 and f5, it is a variation of the Dutch Defense.
See more at Wikipedia.org...