Hearts of Iron II is a grand strategy game. The smallest independent land unit is the division, although brigades such as engineers, artillery, or armoured cars can be attached to these. On sea, units are either single capital ships or flotillas of small ships such as destroyers. For the air force, the unit is a Wing or Group, depending on nationality. Land divisions include infantry, cavalry, and tanks. Land brigades include anti-tank guns, anti-aircraft artillery and military police. On the map the player can direct divisions or groups of divisions. Fighting starts when an army starts moving into a defended enemy territory. The invading units do not have to be inside enemy territory to attack. A province is immediately occupied when the invaders arrive there with no opposition left. Because of this, a player can blitz through large swaths of enemy lands with minimal micromanagement. In addition, units who move constantly lose organization and risk losing supply, so poorly executed attempts to blitzkrieg can be stopped. Provinces can be fortified and infrastructure increased to improve combat performance. Structures include radar, and static AA. Many fortifications are pre-built, such as the Maginot Line along the French-German border. Air units include bombers, fighters and transports. These divisions can, depending on type, engage in tactical or strategic missions. Sea units include transports, aircraft carriers, battleships, cruisers, destroyers, and submarines. Each unit has a strength, speed, and effective engagement range. Naval combats simulate the range between fleets, allowing only units in range to fire. This can make naval combats tactically complex. In November 2005, a stand-alone expansion pack to the game, Hearts of Iron II: Doomsday, was announced and it was released April 4, 2006. It contains everything that was in the original game while highlighting and expanding the period after historical World War II, including a hypothetical nuclear war between the Soviet Union and the Allies. The expansion pack features among other things a reworked intelligence model (which allows the player to use espionage, sabotage and other things in an "intelligence page" accessible through the main screen), improved AI and a scenario editor. Doomsday also features some other changes and additions such as: Additional graphics such as bomber sprites Escort Carriers Hospitals that recover manpower losses A "do not upgrade" button for divisions The option of automating the production sliders Submarines have separate stats for convoy raiding and naval combat An extended timeframe — the game end date has been changed to 1953 New technologies to bring the game into the cold war era An included scenario editor The ability to trade divisions between nations The ability to attach escorts while recruiting divisions
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E - Everyone