From the publishers website:
The Hedgerow Hell Memoir '44 Overlord BattleMap expansion includes a large-scale, double-sided map with two new Memoir '44 Overlord Scenario's - Hedgerow Hell and The Cadets of Saumur, plus 6 new Dodge Truck miniature figures. The oversized map, which is 57 x 27.5 inches in size, is ready-to-play with all terrain, obstacles and unit positions pre-printed - just add figures! It also features the scenario rules, terrain and unit summary cards, and historical background.
Perfect for group play at home or gaming events with fellow Memoir '44 friends, the Overlord BattleMap series is designed for 2 to 8 players and requires either 1 copy of the original Memoir '44 board game, plus the Operation Overlord Expansion; or 2 copies of the board game.'
Expands:
Memoir '44 (2 copies required)
-or-
Memoir '44: Operation Overlord (1 copy with the base game)