SummaryД¬hoosing the right doctrine is an important component of Hearts of Iron IV. Thanks to most of itвЂ™s bonuses being oriented around planning, making details battleplans is a must with this doctrine. It is the default doctrine for several countries due to itвЂ™s generic bonuses, including France, Italy, and Japan. ItвЂ™s bonuses primarily apply to planning, although it has some minor boosts for infantry. Grand BattleplanДЄmong the weakest doctrines in the game, Grand Battleplan is rarely used due to its weak bonuses and lack of specialization. This doctrine should only be used in a few niche circumstances, such as when you are a large country attacking minor ones, or are desperately defending against a larger foe. There is a path to receiving bonuses to more advanced armored and mobilized divisions, but if you can produce these you should switch to a different doctrine, such as Mobile Warfare or Superior Firepower. This isnвЂ™t a viable offensive strategy, although it can be useful for countries with high manpower such as the Soviet Union or China. Most of the path emphasizes throwing more men at a problem and giving defensive bonuses. Mass Assault is a unique doctrine due to it not being meant to be a permanent strategy. Usually you will want a significant industrial base to utilize this doctrine to its fullest extent, but if you go down the mobile infantry path it could be a viable option. It emphasized high concentrations of force at one point to break an enemies defensive line.

Mobile Warfare is heavily inspired by the blitzkrieg concept utilized by Germany in World War 2. Within this path you will have the option to focus on either armored divisions or mobile divisions, with each path providing bonuses to their respective unit. The default doctrine for Germany, this doctrine heavily emphasizes tanks and mobile infantry divisions. Use this if you prefer to have armies heavily based on infantry and artillery divisions, or if you simply donвЂ™t have the industrial capabilities to use Mobile Warfare. Superior Firepower is based on the concept of вЂњShock and awe,вЂќ a military strategy that employs great displays of force and significant usage of explosive weapons against the enemy. Along with those it benefits all support companies, making it compatible with virtually every division you have. It emphasizes heavy use of artillery and infantry, which are the most common battalions in the game. Widely considered one of the most powerful options, Superior Firepower is a great choice in just about any situation. Which doctrine you use will depend on several factors, such as your playstyle, industrial capacity, and geographic position. Land doctrines are technology trees that allow you to specialize the strategies your army uses. Outside of creating strong divisions, choosing the right land doctrine is the most impactful decision you can make about your armies effectiveness.

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