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yoroba

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I'm playing Denmark and I want to fortify Sjaelland to protect it from invasions through Jytland. (It is actually Funen I want to fortify, but in HOI it's part of Sjaelland).

So do I build sea forts or land forts?

Sea forts would make the most sense (if you're from Denmark I guess), but I have a feeling, that they only protect from amphibious invasions.
 

Dalwin

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I think any crossing that units can take without an actual amphibious invasion is countered by land forts. It is in a way a land connection. It may not make complete logical sense but I am fairly sure that is how the game does it.
 

PG908

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Just ran a test as Denmark, land forts guard strait crossings.

So you can actually game it a little by landing amphibious landings on strait crossings that only have land forts. Don't know when that'd be useful, but it is an option.
 

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Don't know when that'd be useful, but it is an option.

El-Alamein with No Man's Land mod. There is only one province to attack from on the Italian side, so it's hard to reduce the fort penalties. Hit it with amphibious while land forces attack by land. You might get fewer penalties on the amphibious side if the land forts are past a certain point.

The Suez might also be an issue. If the Suez is contested, land both at the actual mouth of the Suez and a few other planes. Watch it fold.