Does anyone have any knowledge about the effects of closing a strait? For example, will closing both the Suez and Gibraltar as Italy prevent GB from entering or leaving the med, and trap the fleets inside of the med?
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Closing of Straits
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From Dev Diary 56
So it appears that contested straits tend to disallow anyone from passing through with ships, and enemy ones do the same for your ships, with some exceptions for submarines.
It will probably depend on the specific one, however. Panama Canal as a given example is neutral, so allows only trade through.
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Straits and Canals
The straits system in HOI4 is our most flexible and moddable yet. Each strait can have different rules to better match historical rules rather than trying to fit it all under a general blanket. Each strait has a list of provinces that needs to be controlled to decide the rules and they can have 4 states in relation to you:
Friendly - you and allies control all provinces.
Contested - Control of provinces is mixed between you and someone you are at war with generally blocking you both.
Enemy - Controlled by enemy, generally blocking you completely although some may let submarines through.
Neutral - You are neither friend or foe. Usually means you can go through unless it's something like the Panama Canal, or the Turkish Straits where only trade is allowed.
For each of these a strait can specify what happens with military transports, fleets, trade and submarines.
So it appears that contested straits tend to disallow anyone from passing through with ships, and enemy ones do the same for your ships, with some exceptions for submarines.
It will probably depend on the specific one, however. Panama Canal as a given example is neutral, so allows only trade through.
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To your example: yes, closing both entrances to the Mediterranean would block out the Brits, and indeed that'll probably be a popular Italian strategy.
Different straits will have different rules; for example, Gibraltar shouldn't block submarines, while sneaking a U-Boat through the multi-lock Panama Canal would be very impressive indeed.
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I was more focused on what happens to the fleets trapped in there, if there are then are they stuck with out supply (if ships have supply) or do they just continue with their orders until they are sunk or are relived?
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exactly, it could change the game entirely if you are able to trap a huge portion of the Royal navy in the med and then destroy the fleets with no chance to be repaired. Maybe we can get a moderator/dev in here to clear up these questions.
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As there is no "naval supplies" and ships don't need fuel once built, all they need is a basing port and enough local "supply capacity" to avoid penalties.
So if after closing the Mediterranean you capture many provinces and/or their ports, they will end up with poor supply or completely out of supply.
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You will be able to trap them, yes. In order to defeat them entirely you would have to capture Egypt tho to cut them off from the local supply from there.
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i was thinking more along the lines of close both straits then bomb the heck out of the fleets like fish in a giant barrel
that is possible aswell of course, provided you got enough Close Air Support and Naval Bombers available of course.
If they have a port, they can repair.
Unless the port needs to be linked to your homeland to be able to make repairs ?
Well why would they have a friendly port in the Med? I assume you can make france surrender quite quickly, her colonies go to will also so the Vitchy France. You would have control of the coast of Egypt if you control Suez and the Levant should be within your grasp.
Nobody is stopping you as Italian from swarming those ports with ground troop to cut it off except for British troops of course.
Had you made just a little effort you would have seen I said exactly that a few posts earlier (#7)
Well IIRC UK still has Cyprus and Palestine, friendly Greece (if they have not already surrendered).
Gilbratar isn't a canal which I'm fairly certain means that it's impossible to close.
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Gibraltar (depending on how the strait was closed), Syria and Malta.
You can only prevent the fleet from repairing if you capture every Allied port. But if you block the two straits then they can't get supplies transported from London, if they still have a base.
But surely if the Gibraltar Strait was blocked, and there was any threat to Suez, then you would rebase your fleets to the Red Sea, and cancel any orders to patrol the Med, before the blocking state is captured.
It's technically possible to trap ships, but should be very unlikely. You can't trap subs - they can continue to pass through Gibraltar, in or out of the Med.
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