Mont St. Jean is the French name for the Battle of Waterloo, and the Prussians called this The Battle of Belle Alliance.
This Game came in 2 Editions, an Expansion Kit Edition and a Deluxe Edition. For the Expansion Kit you must own "La Bataille de Ligny" and "La Bataille des Quatre Bras" as it only contains Maps, Special Rules and Background. This Deluxe Edition contains those Items plus the Counters and Basic Rules.
The Deluxe Edition contains four 34x22" Maps, 3 Organizational Displays, Standard Rules & Special Rulebook, 6 Counter Sheets (2 Quatre Bras, 3 Ligny and 1 Informational Markers), Charts & Tables.