West Wall is one of the Quad series that SPI published - a grouping of 4 different battles of a war, using a set of standard rules with a separate set of exclusive rules for each battle. This Quad contained the battles of: Arnhem (Operation Market-Garden) Bastogne (Bulge) Hurtgen Forest (Roer river valley) Remagen (Rhine bridgehead) As wargames go, these series were relatively simple and quick to learn and to play - playability was favored over chrome and complexity. Arnhem was actually released separately as a full retail product with mounted board.