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- 1 Land warfare
- 2 Air warfare
- 3 Naval warfare
- 4 Capitulation and defeat
- 5 Volunteers and expeditionary forces
- 6 War goal
- Main article: Land warfare
Land warfare is warfare on land. Land warfare is performed by divisions, subdivided in regiments. Divisions form an army together which may be led by a commander.
- Main article: Air warfare
Air warfare is warfare in the air. Air warfare is performed by air wings containing airplanes, who may compete over the air superiority in a certain strategic region with the enemy, bomb enemy factories, airfields and infrastructure, provide close air support for land divisions and attack ships that are either docked or on active missions. Air wings are not led by commanders but may generate skilled pilots, called aces, who may give bonuses.
- Main article: Naval warfare
Naval warfare at sea. Naval warfare is performed by fleets containing ships, who may compete over the naval superiority in a certain naval strategic region as well as interrupt enemy convoy activity and defend friendly convoy activity.
Capitulation and defeat
Capitulation is a process that occurs during warfare when the percentage of a country's victory points under enemy occupation exceeds the country's national unity. This calculation is not the same as Hearts of Iron III - every province counts at least one point towards the victory point total, named cities count 10x their displayed Victory Point level. One still needs to capture the main Victory Point cities, but the large number of unnamed provinces can add up to a significant amount either in their home land or overseas.
When a country capitulates, it will lose all troops in home territories and either retreat to distant colonies or ally states. Furthermore, all core provinces (and provinces contiguous with core provinces) without allied troops occupying them will be lost to the enemy with the most occupied victory points.
Capitulation does not mean instant defeat for a country. If the country is in a faction, the war will not be over until all major faction members are defeated; this means minor nations may also be forced to surrender in a war even when they themselves did not fall.
War participation is a measure of a country's contribution to the war effort. War participation can be accumulated by a country for
- Bombing Enemy provinces
- Establishing occupation of enemy provinces (changing control from enemy to friendly flag). Other friendly troops entering or remaining in the province later on do not gain occupation score. Occupation score is not lost by giving territory to another friendly power to occupy.
- Losing Manpower while combating the enemy - those whose blood buys victory shall have a share in the spoils.
Each action accumulates score, which is then compared to the overall score of the alliance to produce a percentage of war participation. This score is used during peace conferences. It also affects requests to an ally to hand over control of an occupied state in wartime.
When a war has ended, and all enemy nations defeated, a Peace Conference will be launched. During a Peace Conference, victor countries can make demands of the defeated countries, demanding things such as
- Releasing nations
- Releasing nations with victor's ideology (essentially as a puppet)
- Returning territory
- Returning core territory
- Ceding states (to either the country itself or to its puppets)
- Changing ideology
The conference proceeds in one or more rounds with each country taking its turn in making demands in order of decreasing score remaining until all have dropped out, spent all their score, or no available demands remain. An important restriction is that a country can spend in its turn only the difference between its own current score and the country with the next highest score at most. A country can choose to pass in its turn before spending all its score, which will provide a small bonus for its turn next round. A country can also drop out entirely, which gives any unspent score to its allies to spend. A country also may demand territory on behalf of an ally or puppet by selecting their flag in the list in the left column before selecting territory. Puppets themselves do not get a round for making demands in a conference.
Upon the completion of a peace conference, states gained through the conference will lose any resistance and reduced factory output modifiers. Furthermore, an auto-save will always occur, saving the gamestate just before the launch of the peace conference.
Volunteers and expeditionary forces
Volunteers and Expeditionary Forces are ways of sending soldiers to Wars, or aiding Allies, without having to be a part of the War.
Sending Volunteers is a way to for a country to send divisions to fight in the wars of other countries without joining that war itself. It is a great way to gain Experience in the years before major wars break out and for a country to influence the outcome of a war without becoming diplomatically involved. Volunteers can also be used by a player to field test a division template in combat conditions. Volunteers are controlled, supplied and reinforced by the country that sends them, not the country that receives them. Sending Volunteers increases World Tension.
A nation can only have Volunteers abroad while not at war. The ability to send Volunteers is limited by Ideology and World Tension, where Fascists can do so whenever they like and at the other extreme Democracies are fairly limited. France has an ability to do so earlier.
In order to send Volunteers they must first be formed into an army. They may be assigned a commander, who can earn experience and traits as well. They are then sent through the Send Volunteers diplomatic action. Once the army arrives, a new army theatre is created for the player and the Volunteer army group is automatically added to it. Armies cannot be transferred to or from these special theatres, even if other countries have volunteers from the same source. It takes two weeks for a Volunteer force to travel to the receiving country or to return. They return home if their home nation finds itself at war or the country that received them finds itself at peace. When volunteers return, they bring 95% of their equipment with them. The remainder is lost in transit or remains in the destination country. Volunteer divisions can also be disbanded, which returns the manpower and equipment to the sending country, but requires a new division to be formed and trained to replace the disbanded one.
The number of divisions that can be deployed is 1 division for every 20 active divisions (rounded down, so with 19 or fewer no Volunteers can be sent). For example 176 active divisions means 8 divisions where 181 would mean 9 divisions could be deployed as volunteers. Note that a division with only 1 battalion in it counts as much as one that has 25. The minimum of 20 divisions with 1 infantry will enable 1 volunteer division to be sent. The sending country must have at least 30 divisions to send volunteers at all. Added to this is one division per 20 provinces in the destination country.
Sending Expeditionary Forces is a way to hand over troops to allies in war. It is useful if the player doesn’t want to control them, or if AI wants to fight in a theatre and thinks the receiving player will do a better job. They can be handed over and returned at any time. Disbanding an expeditionary division has the effect of returning it. AI will often ship them as well if it has convoys available.
Some issues regarding Expeditionary Forces can be clarified in full by testing, while others await guidance from the development team. Testing shows that war score for occupation by an Expeditionary Force goes to the country controlling them, while war score for casualties goes to the home country (the one providing the Expeditionary Force). Destructive testing of expeditionary forces and observation of such forces with depleted equipment indicates that manpower and equipment reinforcements are drawn from the the home country pools. However, there are many players who have attributed manpower drains to expeditionary forces. It may be possible to test (and worthwhile to discover) whether at the time that the home pool runs out these units cease to reinforce or do they instead draw from the host country's pool, which would explain these reported anomalies.
Expeditionary Force divisions can gain experience but their template may not be modified by the receiving country. Players receiving Expeditionary Forces may wish to provide Lend-Lease shipments to the home country of equipment types that it may use to supply the Expeditionary Forces. Some of the home country's equipment may appear in the controller's stockpile, which might possibly relate to the loss of related manpower and salvaging of equipment by the controller.
Some other open topics for investigation and testing are how the army experience generated by the Expeditionary Force in combat or in military exercises is allocated, and confirming the manpower and equipment effects of template changes by the home country.
A war goal is needed to declare war. A war goal is usually a conquest of a desired state.
Justifying a war goal costs political power, increases world tension and usually takes between 6-9 months to complete. When a country has a war goal, it can start a war against the target country. Countries succeeding in their war goals get an advantage in peace conferences. There are several national focus that will give countries historical war goals. However, ahistorical war goals are also possible, such as Sweden restoring its historical borders. The target state of the wargoal can be claimed at a discount at the peace conference.
Besides the national focus, war goal justification will require one or multiple conditions to be met before it can even begin. The conditions will be different depending on the ideology (Communism, Democracy, Fascism or Non-aligned) as well as the faction (Allies, Axis, Commintern, others) and the World Tension level.
Communists have virtually no restriction on justifying war goals.
- Cannot start a war against another democracy.
- Cannot justify against a nation that has not increased the world tension.
If a fascist country already has a war ongoing, they can justify a new wargoal much faster than normal.
All ideologies have one or multiple effect on the cost of war goal justification or enactment at the peace conference.
- Can force government.
- 70% cost reduction when puppeting other countries.
- Cannot send volunteers.
- Cannot puppet another country.
- Cannot occupy a country without war (captured neutral territory will be returned).
- 25% cost increase of Taking States.
- 50% cost increase of Annexing country.
Political power cost
It's necessary to spend a certain amount of political power to start justification of a war goal.
The base cost is xx, then the following modifications can apply:
- -90% When justifying war goal against a major power at war.
Once the justification is ongoing, It will also be necessary to spend 0.2 political power per day on the war goal justification to complete it in the minimum number of days. Any deficiency in political power will stall the war goal justification.