... Hoi4 Germany Guide 2020! Since the release of Hoi4, players have figured out that base provinces have around 80 combat width. Answer (1 of 2): In my honest opinion, Mobile Warfare and Superior Firepower are two of the best land doctrines in the game. Virtually all units have low hardness, so soft attack is more important than hard attack. This doctrine concerns all of the land units and this is what makes it an universal . 1 Description 2 Components 3 Effects 4 Strategy 5 See also Air superiority is the dominance in the air power of one side's air forces over the other side's during a military campaign. Naval doctrine - Hearts of Iron 4 Wiki - Paradox Wikis This is a more challenging area. Navy: A HOI4 Guide Best Air Doctrine Hoi4 - fasrlux hoi4 Second best land doctrine is the superior firepower, if you have a somewhat average-big industry to back it up. Caution: Do not attempt attacking the pure tank divisions.