HOI4 Dev Diary - Mines and Minesweeping
HoI4 Dev Diary - Resistance and Compliance
Podcat, Oberkommando HOI4
Welcome to another glorious Wednesday! Today we are going to be talking about mines and mine sweeping. Historically hundreds of thousands of mines were laid during WW2 and with Man the Guns you too will be able to do so in Hearts of Iron.
YaBoy_Bobby, HoI IV Game Designer
欢迎来到另一个美好的周三！今天我们要来讲一讲水雷和扫雷。历史上各交战国在二战期间铺设了成百上千的水雷，而如今随着炮手就位Man the Guns的更新，你现在也能在钢铁雄心里这么做了。
Hello HoI bois and ladies, welcome to the second dev diary on our upcoming unannounced expansion and 1.8 ‘Husky’ update. This update features some big changes to how occupied territory functions. The biggest part of this is an overhaul of the game’s current resistance system into what we are calling the “Resistance and Compliance” system. This should help curb a bit of power from snowballing (Hello, Germany), remove gamey early war sniping of provinces, and put a bit of a clock on world conquest runs.
From a gameplay perspective mines do a lot of interesting things. They add more interaction with the naval layer of the game, create a weapon both for smaller naval nations to fight bigger ones, and for big ones to try and limit where the enemy can get to them.
HOI的诸位玩家们大家吼啊！欢迎来到关于我们即将到来但尚未公开的扩展包以及1.8版本号“哈士奇husky”更新的第二篇开发日志。这次更新对占领区域的运作方式进行了一些重大更改。其中最重要的部分是将游戏现有的抵抗系统重制为“抵抗与顺从Resistance and Compliance”机制。这将略有助于抑制滚雪球的效果（说的就是你，德国），消除早战夺取特定省份玩法的效果，并延长世界征服体验的时长。
As you may remember from my presentation at PDXCON, I talked about adding a ship designer to Man the Guns. It is not quite ready to show off, but it’s important to know that sweeping and laying mines are something you will be upgrading or redesigning your ships to be doing. Minelayers and Minesweepers are not actually new ship classes. In my screenies I have destroyers that can both lay and sweep mines for simplicity, but as @Archangel85 pointed out earlier “I am probably going to have a ton of different destroyer designs”... anyways, details on the designer is for a future diary when it is done, but hopefully it helps explain some stuff in the proper context.
Mines are unlocked from techs and require ship designs fitted to deploy them. Destroyers and light cruisers can do this, as well as submarines with the correct tech (excellent if you as Germany want to make things even more dangerous for the British at a lower risk to yourself). Mines can also be dropped from the air with later game techs. Both of these unlock new missions for navies and airwings.
The old resistance system is rather simple. Each occupied state has a suppression requirement. If you meet that requirement nothing happens. If the suppression requirement is not met then you suffer from increasingly common sabotage to factories or infrastructure as resistance strength grows. We decided we could make this more interesting and use it as a way to further control the power of snowballing.
Mines can be made better and better through research. You start off with Contact Mines to unlock them. Then their destructive power is improved with Magnetic and Acoustic mine techs and finally with Pressure mines. At the bottom (heh) you also see two techs for submarine mine laying. The first is just the basic ability, while the second improves efficiency a lot by allowing mines to be deployed through torpedo tubes, thus no longer requiring you to design specialized minelaying submarines.
The growth of resistance is no longer stopped by having an adequate garrison. Resistance now functions with a target system. The resistance level will grow or decay towards whatever the current target is. The target is impacted by the development of the state, the core owner still existing and other factors. Resistance activities will still scale with the level of resistance, but the garrison will now work as a shield that absorbs these sabotages. If the garrison is adequate, the garrison shield will absorb the vast majority of sabotage attempts and take losses to manpower and equipment. Not having an adequate garrison means a higher resistance target and more resistance activity making it past the garrison shield to the state.
To get rid of mines you need minesweeper capable ships. This unlocks the naval mission to sweep mines and will slowly work at clearing areas. Minesweepers are also nice to include in your fleets as they will then be assumed to travel ahead of the fleet and reduce the impact of mines on them. I suspect a good design combo will be anti-air and sweeper on screen ships to be your passive defense when in enemy waters.
There is also a passive “degaussing” technology that can be researched after Magnetic Mines. This was employed during WW2 to reduce the magnetic signature of ships and thus make them less likely to set off mines.
It is also possible to sweep mines from the air, but this is a late game, expensive technology and unlocks a new air mission for bombers. This was something that was done sparingly and in shallow waters, but for example was successfully done to evacuate the Dutch royal family to Britain.
Compliance is in some ways the opposite of resistance. It is a rating of how willing the local state is to work with their occupiers. Compliance will normally start at zero and increase slowly over time. Compliance growth will generally be slow and several factors can affect that speed of growth. As compliance increases in a state, it will decrease local resistance and give access to more resources, factories, and manpower.
What do mines exactly do then? Well they blow stuff up! Their explosive results are shown on map as accident reports, and there is a new tab too under the Naval Losses statistics interface if you want to dig into details. As ships operate or move through a zone they will risk running into mines. This can lead both to minor damage as well as outright sinkings. The best ways to avoid this is to make sure the area is swept free of mines, but as mentioned above, having your ships travel with sweeping capable ships makes it safer for all.
This is not all through, mines have several passive effects.
Resistance and compliance also will have various effects that are unlocked. Resistance will gain the ability to more frequently bypass the garrison shield after it reaches a strength of 25%. Reaching 25% compliance means reducing suppression requirements for the current level of resistance.
Naval superiority - Having mines in an area helps amplify the effects of your navy (after all they can concentrate more effectively knowing where the mine fields are). This can be seen in our new naval area screen, which is the naval equivalent of the state view:
制海权 - 一片有水雷的海域可以增强海域中海军的效率（毕竟知道雷区都在哪里之后，她们可以更好地集中精力）。这项内容可以在我们新版的海军界面中看到，其为展示了海军相对力量的海域地块视图。
The highest level of resistance unlocks include two levels of uprising. The first is a passive malus that is applied to the state, adding attrition, decreasing move speed, and slowing org regain for occupying forces in the area. The 2nd level uprising is a full scale organized uprising that functions somewhat like a civil war. The states that rise up will gain low-quality divisions and either rejoin their former master or if that no longer exists, reestablish themselves on the map. Both of these should be somewhat rare and will require the local resistance being supported by an outside source.
Other than that and blowing ships up mines will slow down enemy ships (since they need to be more careful) and increases the invasion penalty to coastal area. So mines are both good offensively and defensively.
Mines can only be laid while at war and will start to disappear over time once a nation is completely at peace. You always know how much mines there are in an area, so you know how to deal with them and take them into account. That means that with the new naval access controls you can tell your ships and convoys to avoid heavily mined areas, but of course this may make it a lot more predictable for your enemies where to hunt. Having an advantage in the encryption-decryption war will also add a certain amount of passive defense against mine effects as you may have some information about their positioning.
In conjunction with these new systems, we have reworked how occupied states are handled. Colony states will be removed as a concept and every state not controlled by a nation with a core on the state will be viewed as occupied. Occupied states will now be less rewarding for the occupier. Access to the factories and resources of the state will by default be much lower than before. However, the conqueror can get more out of the state by cultivating compliance or adjusting occupation laws. This gives a bit of granularity between what was previously colony states and cores.
Occupation laws will also be updated to work with the new resistance and compliance systems and give the player more choice. Previous occupation laws were mostly a linear system of paying PP and increasing suppression need for increasing rewards. If you could afford it, harsher occupation would almost always be more beneficial. This was also a system not a lot of people interacted with as it was hidden behind several layers of the menu.
New occupation laws are built around trying to give the player choice based on playstyle and short and longterm goals. The new laws tend towards one of three objectives: compliance growth, resistance suppression, factory/resource exploitation. Compliance growth is a longterm reward, while resistance suppression and resource gains are more short term. These laws will, in turn, be bad at what they are not concerned with. IE focusing on resistance suppression will generally not be very rewarding in terms of resources or long term compliance growth. Cultivating compliance will mean that the player will have to deal with a period of low yields and maybe a more active resistance movement. Each of the big three ideologies will also get their own special occupation laws. These laws fit the themes of the ideologies and give them some unique choices
That's all we got for this week. Next week we will update the good people of these forums on what is going on with France. Secrets and things hidden will be revealed!