How do you defend against a Naval Invasion?

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KalZakath

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They were out already in HOI3
 

Sir Garnet

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Another thing from Da9l's WWW as Japan is that if you land and can grab enough land to gain 51% of a state/area, you're able to use the supply from the state. That probably isn't going to be enough to launch a major offensive from there or anything, but it could make it enough for the invader to be really difficult to be pushed out. With some of the smaller states/areas this might be a quick thing that will let you be more leisurely about the taking of the ports to get the full supply in.

And at least keeps the troops as a force in being even if not at full capabilities. I assume at 49% of the state you don't get any of the supply.
 

kviiri

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Is it true that EVERY coastal pronvice can be invaded by sea.

The beaches are removed?
I domt like it

Yes and no. You can land troops pretty much anywhere along the coast as far as I know, but you probably shouldn't. You need a port to supply your guys quite soon after the initial landfall, so striking at or near one is the most viable way.