Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Darkest Hour: A Hearts of Iron Game, or DH, is a grand strategy wargame that is based on Paradox Interactive's Europa engine. It is described as a 1914-1964 Grand Strategy Game and it allows the player to take control of and manage nearly any nation-state during the 1914-1964 timeframe including its political, diplomatic, espionage, economic, military, and technologica ...