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: The time required depends on your technology and the number of divisions assigned (e.g., a 10-division invasion takes much longer to prepare than a 1-division one).

: Select your divisions and look for the yellow/orange bar next to their icons. This bar fills while they are stationary at the front line. download-hearts-of-iron-iv-field-marshal-edition-v1-12-7-p2p

: You must build an Intel Network in the target country first. Once the network is strong enough, you can launch the "Prepare Collaboration" operation from the Operations tab. 3. Naval Invasion Preparation : The time required depends on your technology

Naval invasions cannot be launched instantly; they require a "preparation time". download-hearts-of-iron-iv-field-marshal-edition-v1-12-7-p2p

Units assigned to a (front line and offensive line) automatically accumulate a "planning bonus" over time.