Hearts of Iron IV - DD 15 - On the High Seas

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podcat

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Hi everyone! I'm home from vacationing in the US now and visiting the Battleship USS Iowa in Los Angeles. So I thought talking more about navies would be appropriate!

LbohEJn.jpg


Sadly the class was refitted for the cold war era and lost its bristling of AA guns for Tomahawks. Luckily FDR's bathtub was still there though :)

We have previously covered the actual naval combat here so read that again if you need a refresher. Today we will be looking more at the big picture stuff.

Areas & Missions
Just like the strategic air war navies spend most of their time on missions in strategic areas, but are also able to move province by province. When in a strategic area each fleet has a value indicating how spread out it is. In general a more spread out fleet can cover more area and have a higher chance of finding the enemy, but will take time to concentrate its forces and bring them all to bear. Things like how fast fleets of a certain composition can converge and how well they can search in an area is controlled in large part from Naval Doctrines. We'll cover those in detail in a future diary, but as an example if you pick the Trade Interdiction doctrine you can unlock Wolfpack tactics which will make sure your subs find more targets and can all get together and strike more often.

c3ZfEd9.jpg


There are several missions available:
Patrol - Focus on finding the enemy as efficiently and as spread out as possible
Search & Destroy - Much like Patrol but less efficient at searching while keeping the fleet together more. Suitable for trying to force large fleet vs fleet battles, say like the Battle of Midway.
Convoy Raiding - Focus on raiding convoys and avoid engaging warships.
Convoy Escort - Protect any convoys in an area from raiders.
Invasion - used to control large scale land invasions. We'll cover this in later diaries.
Hold - Not really a mission, but can be useful for ships like Carriers that you want to just position like a floating airfield.

When fleets find each other or convoys of the enemy naval combats will trigger. Depending on how spread out the fleet is, doctrines and luck its going to be a smaller part of the fleet that makes initial contact. Naval battles in HOI4 can simulate longer affairs where ships join over time as the rest of the fleet rushes to help.

Strategic warfare
While you need to actually directly conquer an enemy to beat them, doing so after they are weakened is always better and easier. Production in HOI4 requires resources that gets convoyed from trade, or from overseas territory so a good way of weakening an enemy is to hurt their ability to produce equipment and reinforce their armies using convoy raiders. In HOI3 it never really felt like submarine warfare had enough impact and we want to fix that in HOI4 and force nations to have to spend resources to counter it. The way the strategic area mission system works also allow you to use surface raiders, like how Germany historically used its few heavy cruisers to tie up and frighten the British navy.

tn6kh7x.jpg


Convoys are extremely important and transport both replacement equipment to oversea battlefields, supplies and resources so hurting them will have a large effect, sunk convoys can't be instantly replaced either so active defense is necessary, you cant just try to outproduce the enemy's sinking. Lend lease of equipment and tanks to allies also use convoys and this material can all be lost to the bottom of the ocean when faced with an efficient submarine net.
 
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Jorvikson

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Nice to see how strategic warfare will work properly this time round, in hoi3 it didn't fell like it did much
 
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podcat

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Big Nev

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Hi everyone! I'm home from vacationing in the US now and visiting the Battleship USS Iowa in Los Angeles. So I thought talking more about navies would be appropriate!

LbohEJn.jpg


Sadly the class was refitted for the cold war era and lost its bristling of AA guns for Tomahawks. Luckily FDR's bathtub was still there though :)

We have previously covered the actual naval combat here so read that again if you need a refresher. Today we will be looking more at the big picture stuff.

Areas & Missions
Just like the strategic air war navies spend most of their time on missions in strategic areas, but are also able to move province by province. When in a strategic area each fleet has a value indicating how spread out it is. In general a more spread out fleet can cover more area and have a higher chance of finding the enemy, but will take time to concentrate its forces and bring them all to bear. Things like how fast fleets of a certain composition can converge and how well they can search in an area is controlled in large part from Naval Doctrines. We'll cover those in detail in a future diary, but as an example if you pick the Trade Interdiction doctrine you can unlock Wolfpack tactics which will make sure your subs find more targets and can all get together and strike more often.

c3ZfEd9.jpg


There are several missions available:
Patrol - Focus on finding the enemy as efficiently and as spread out as possible
Search & Destroy - Much like Patrol but less efficient at searching while keeping the fleet together more. Suitable for trying to force large fleet vs fleet battles, say like the Battle of Midway.
Convoy Raiding - Focus on raiding convoys and avoid engaging warships.
Convoy Escort - Protect any convoys in an area from raiders.
Invasion - used to control large scale land invasions. We'll cover this in later diaries.
Hold - Not really a mission, but can be useful for ships like Carriers that you want to just position like a floating airfield.

When fleets find each other or convoys of the enemy naval combats will trigger. Depending on how spread out the fleet is, doctrines and luck its going to be a smaller part of the fleet that makes initial contact. Naval battles in HOI4 can simulate longer affairs where ships join over time as the rest of the fleet rushes to help.

Strategic warfare
While you need to actually directly conquer an enemy to beat them, doing so after they are weakened is always better and easier. Production in HOI4 requires resources that gets convoyed from trade, or from overseas territory so a good way of weakening an enemy is to hurt their ability to produce equipment and reinforce their armies using convoy raiders. In HOI3 it never really felt like submarine warfare had enough impact and we want to fix that in HOI4 and force nations to have to spend resources to counter it. The way the strategic area mission system works also allow you to use surface raiders, like how Germany historically used its few heavy cruisers to tie up and frighten the British navy.

tn6kh7x.jpg


Convoys are extremely important and transport both replacement equipment to oversea battlefields, supplies and resources so hurting them will have a large effect, sunk convoys can't be instantly replaced either so active defense is necessary, you cant just try to outproduce the enemy's sinking. Lend lease of equipment and tanks to allies also use convoys and this material can all be lost to the bottom of the ocean when faced with an efficient submarine net.



First YAY:D


Bollocks :(


Very very happy to see that cargo is lost when a merchant gets sunk.
 
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Gort11

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Being able to strategically defeat the UK or Japan through submarine blockade and air bombardment is something I haven't seen properly done in a HoI game yet, so I'll be interested to see how effective it is this time round.
 
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safe-keeper

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Convoys are extremely important and transport both replacement equipment to oversea battlefields, supplies and resources so hurting them will have a large effect, sunk convoys can't be instantly replaced either so active defense is necessary, you cant just try to outproduce the enemy's sinking. Lend lease of equipment and tanks to allies also use convoys and this material can all be lost to the bottom of the ocean when faced with an efficient submarine net.
I love all of this:).
 
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LostAlone

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This is a great reveal. Really happy to see the thought that's gone into this.
 
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kaspar42

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It looks gorgeous. I'm looking forward to when you'll let us play with it :)

Can we hear about the supply system soon, or are you still hammering down the concept?
 
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agus92

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Really happy about this DD.

I presume that we will be able to deploy our fleet on a specific sea province as well as the strategic province. Am I right?
 

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Convoys are extremely important and transport both replacement equipment to oversea battlefields, supplies and resources so hurting them will have a large effect, sunk convoys can't be instantly replaced either so active defense is necessary, you cant just try to outproduce the enemy's sinking. Lend lease of equipment and tanks to allies also use convoys and this material can all be lost to the bottom of the ocean when faced with an efficient submarine net.

Awesome!
 

Zoob

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Podcat when you say about shipping replacement equipment overseas, does this mean that equipment has a location, rather than just being in a pool, so if I built a factory in hong kong and had it pumping out small arms and trucks, would the hong kong garrison be able to reinforce directly from the production of this factory, or would they have to still be resupplied from abroard. When you say replacement equipment is that just shorthand for "supply to regain org/morale" or do tanks and such actually need to be shipped across the ocean to units to replace losses.

If that was the case, I suppose you could see units in cut off stalingrad having lost tanks replaced directly from T34s rolling out of the Stalingrad heavy industry.
 

Wyrm

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I like the look of this. Seems we will be able to avoid them uber-stack-clashes to some degree and have a small fleet be able to survive an engagement by a superior force long enough to withdraw without getting completely slaughtered.


It also looks like that a good enough blockade will give us an ability to make a specific area of operations starve due to lack of supplies and replacement equipment. Such as North Africa :)
 
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Centurion1973

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Question to Podcat about strategic resources: since natural rubber wasnt available to many countries, during the war, how will it be handled? Will we have to build synthetic rubber plants?
 
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Podcat when you say about shipping replacement equipment overseas, does this mean that equipment has a location, rather than just being in a pool, so if I built a factory in hong kong and had it pumping out small arms and trucks, would the hong kong garrison be able to reinforce directly from the production of this factory, or would they have to still be resupplied from abroard. When you say replacement equipment is that just shorthand for "supply to regain org/morale" or do tanks and such actually need to be shipped across the ocean to units to replace losses.

If that was the case, I suppose you could see units in cut off stalingrad having lost tanks replaced directly from T34s rolling out of the Stalingrad heavy industry.

Equipment manufacture isnt assigned to specific factories, so we wont be able to for example make tanks in Honk Kong, and aircraft in UK.
 
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Convoys are extremely important and transport both replacement equipment to oversea battlefields, supplies and resources so hurting them will have a large effect, sunk convoys can't be instantly replaced either so active defense is necessary, you cant just try to outproduce the enemy's sinking. Lend lease of equipment and tanks to allies also use convoys and this material can all be lost to the bottom of the ocean when faced with an efficient submarine net.

This sounds fantastic; thanks for the update. :)

I'm also really glad that we finally have a full-screen British screenshot! :p The Brits are always the first country I try in a new Paradox game, and trying to hold together the crumbling British Empire in HOI1 was the moment I fell in love with Paradox grand strategy.