Guadalcanal Campaign August 1942 to February 1943 Operation: Watchtower is the first of the Historical Studies. It combines a mix of scenarios using the traditional ASL geomorphic map boards and a historical map.The historical map is included but the geomorphic boards are part of other modules in the series. Ownership of the ASL rulebook, all core modules, Action Pack #2, and boards 5,15, 43, and 52 are required for play.Expands: Advanced Squad Leader - BoardGameGeek