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Introducing CK3 #10 - War. Pixelated Apollo will cover everything tied to war: how to fight, siege, ransom characters and win wars!
Introducing CK3 #11 - Battles. Pixelated Apollo joins us once again to tell us everything about terrain. From terrain to advantage you shan't lose another battle.

戦争は軍勢を率いて力づくで称号を簒奪することで領国の拡張するという最も直接的な手段です。 あらゆる戦争には開戦事由が必要であり、これは戦争の目的と勝敗によって双方に生じる結果を規定します。 キャラクターが借金している場合は宣戦布告ができません。



敵対関係にある2つの軍勢が同じ男爵領に入ると戦闘が始まります。 戦闘の開始時に、その地形の戦闘幅によって同時に戦闘に参加できる兵士たちの数が決まります。戦闘は4つのフェイズに分かれています。

  • Maneuver phase.png 機動フェイズ: 軍勢は戦闘の準備を開始し、指揮官は最初の優位性ロールを決定します。
  • Early battle phase.png 初期戦闘フェイズ: 軍勢は毎日のように戦い、互いにダメージを与え合います。このときは退却することができません。 このフェイズで戦闘に敗れた場合、すべての敗走兵が死傷者になります。
  • Late battle phase.png 後期戦闘フェイズ: 軍勢は一方の兵士らが耐久力を使い果たすか撤退するまで毎日お互いにダメージを与え合います。 軍勢が退却した場合、残った兵士はすべて敗走兵になります。
  • Aftermath phase.png 追撃フェイズ: 戦闘で勝利した軍勢は敗北した軍勢を追撃し、敗走兵を死傷者にしようとします。 このフェイズが終了すると、敗北した側の軍勢はすべての敗走兵とともに隣接する男爵領へ移動した後、更に2、3つの男爵領分距離を取ろうとします。 この時、移動をし終えるまで命令を与えることはできませんが、操作可能になっている軍勢よりもわずかに移動速度が速くなります。


戦闘開始時には戦闘全体の継続、及びどちらか一方のダメージを増加させる「優位性」補正の計算が双方の軍で行われます。 優位性は特性、地形、建造物、または指揮官の軍事能力によってもたらされます。 また、指揮官は3日ごとに優位性を上げるためにロールを行います。これは様々な補正や特性の影響を受けます。 優位性の各ポイントは自軍のダメージを+2%増加させます。 開始時の優位性は以下の影響を受けます。

  • 海峡を挟んでおり、かつ防衛側である場合 +30
  • 大河を挟んでおり、かつ防衛側である場合 +20
  • 河を挟んでおり、かつ防衛側である場合 +10
  • 主君が軍勢を率いている場合 +5
  • 領国が借金状態にある場合 -10
  • 軍勢が招集中である場合 -10
  • 物資が足りない場合 -10
  • 物資が枯渇している場合 -25
  • 海を挟んでおり、かつ攻撃側である場合 -30


包囲戦は戦勝点を得る主な手段であり、軍勢が要塞のある所領を攻撃中、軍勢がその要塞の 守備隊を上回っている時に発生します。 伯爵領を占領するにはすべての要塞化された所領を占領する必要があります。 城及び伯爵領首都はデフォルトで要塞化されています。要塞包囲の難度は 要塞レベルによって決まり、これは特定の建造物や補正によって上昇させることができます。 所領を占領するのに必要な包囲進行度の基本値は100であり、 要塞レベルごとに50ずつ増加します。 包囲は攻撃側の数が守備隊の数を大きく上回っているか、攻城兵器を用いている場合に時間とともに進行していきます。

要塞化された所領の包囲中に攻撃を受けた場合、包囲側の軍は攻撃側となり、相手側はあらゆる地形防御ボーナスを得ます。 また、要塞が立っている男爵領において戦闘が始まると、優位性に追加のペナルティが発生します。

Each siege will keep track of the defenders' supplies, average health and fortifications. During sieges, certain events can happen by default every 20 days (shortened by 30% to only 14 days with  Military Engineer commander), which can lower one of those. Walls can only be damaged if the attacking army has Siege Weapons.

Asset Stage 1 effects Stage 2 effects Stage 3 effects
Siege action supplies.png Garrison Supplies None Unit stat siege progress.png +10% One-Time Siege Progress Unit stat siege progress.png +30% One-Time Siege Progress
Siege action disease.png Garrison Health None Unit stat siege progress.png +10% Daily Siege Progress Unit stat siege progress.png +20% Daily Siege Progress
Siege action walls.png Walls None -10% Time Between Siege Events
Yes Can assault the Fort
-30% Time Between Siege Events
Yes Can assault the Fort

Assaulting the Fort will add a large amount of daily Siege Progress at the cost of casualties.


Once the besieging forces reach 100% siege progress, they become the controller of the barony. If they control all fortified holdings within a county, they will also occupy the entire county. Upon occupation, the county loses control (unless original owner has the Overseer lifestyle perk Enduring Hardships). Occupying the war target's holdings provides warscore.

War score[編集]

War score is a measure of which side is winning a war. It ranges from -100 to +100, each point added to one side being subtracted at the same time from the other side, e.g. if one side has 25 War score, the other side will have -25 War score. War score is gained by winning Battles, occupying Holdings, taking important prisoners and especially having control of the Casus Belli's Objective, or the "War Target". Even though the game doesn't define the term "War Target", it appears to correspond to whether the defender still has possession of at least one county in the de Jure title being fought over. For example, if this is a kingdom level war for England, then as long as any single county in the de Jure England Kingdom belongs to the defender (i.e. has not been successfully sieged), then the defender retains the war target. The bonus for the War Target starts at 0%, but after awhile starts increasing, and the longer the war goes without the attacker taking every county, the bigger it gets, until it can dominate everything else. In some ways, this can be seen as implementing a "war weariness" component for the attacking side, and makes kingdoms much harder to take then duchies or counties.

Objective Bonus war score
Capturing enemy ruler +100
Capturing enemy heir +50 (primary heir)
+25 (secondary heir)
+10 (tertiary heir)
Occupying enemy capital +10

The benefits given by winning battles is based on the size of the losing army relative to its total soldier count. The benefits given by occupying holdings corresponds to a percentage of the total holdings the defender has, both inside and outside the war target. Note that the percentage allocated to winning battles is limited to 50% total, so there is no way to win a war as an attacker without also occupying holdings.

At +30 War score, the winning side can call for White Peace. At +100 War score, the winning side can enforce their demands on the losing side. Alternatively, at -100 War score, the losing side must surrender to the winning side. This can be modified by Peace Acceptance, particularly with the Peacemaker Lifestyle Perk.

Players can always Surrender to the opposing side, ending the war and enforcing the opposing side's demands on themselves. The AI will also eventually surrender to the player when the player has 100 war score, preventing the player from taking additional captives or inflicting additional damage to their realm.

War contribution[編集]

Wars where either the attacker or the defender has allies keep track of the percentage of War score that was provided by each ally's armies. When the war ends, a certain amount of  Gold,  Prestige or  Piety is shared among all allies based on their War Contribution.

If a war lasts at least 2 years and one of the allies has 0% War Contribution, it will lose -20  Opinion with the war leader and have to pay  Gold or  Prestige or promise to earn War Contribution within a year. Breaking the promise will result in losing a Level of Fame as well as -50  Opinion with the war leader.

Ending wars[編集]

Wars can end in two ways: victory for one side and defeat for the other, or with a White Peace.

If the attacker achieves victory, they benefit from the effects of the used Casus Belli. If the defender achieves victory, the attacker is forced to pay a large sum of Gold to the defender and will lose  Prestige or  Piety.

White Peace can be proposed at any point by one of the two sides and requires the other side to accept it. In case of White Peace, the attacker will lose a small amount of  Prestige or  Piety.

After a War, the allies of both sides will gain  Prestige regardless of who the victor was, based on their Contributions.

When a War ends, the attacker will gain a Truce with the defender for 5 years. If the former attacker declares war again while the Truce is active, they will lose 250  Prestige and one Level of Fame and gain -50 General Opinion for 3 years.

Offensive and defensive wars[編集]

An offensive war is one where you are the attacker. Usually, these are wars that you chose to engage in. A defensive war is one where you are the defender. Alliance After 6 months have passed since the start of a war, the attacker in an offensive war will start to gain negative  Opinion with all Vassals. Every two months afterwards, their  Opinion will decrease by -1. After the war is over, the penalty will decay with the same speed. Civil Wars, defensive wars, and Great Holy Wars do not cause  Opinion loss. Faiths that have the Warmonger tenet also do not suffer this penalty.

Holy wars[編集]

Holy Wars are wars started with one of the Holy War casus belli. Unlike other wars, Rulers of the same Faith as the defending Ruler can join the war without requiring an Alliance. A Ruler targeted by a Holy War gains a character interaction to convert to the attacker's Faith in order to end the war in White Peace at the cost of 100  Piety and 3 Levels of Devotion.

Great holy wars[編集]

Great Holy Wars can only be declared by a Head of Faith whose faith has the Warmonger, Armed Pilgrimages or Struggle and Submission tenets and can only target Kingdoms ruled by a character of a different Faith. If victorious, all Titles within the targeted Kingdom are seized and divided between the attackers based on their War Contribution. Great Holy Wars can be Directed or Undirected. Great Holy Wars do not cause Vassal  Opinion loss no matter how long they last. A faith must have at least 75% fervor to launch a Great Holy War.

During Great Holy Wars, there is no option for White Peace and capturing and imprisoning the opposing war leader or its Heir will not grant War score. If the attacking Faith wins, its Fervor will decrease by -30 while the defending Faith's Fervor will increased by +25%. If the defending Faith wins, the attacking Faith will lose -25 Fervor.

Rulers who contribute to a Great Holy War and knights in the armies that fight such a war will gain the Trait crusader.png Crusader trait if Christian, Trait mujahid.png Mujahid trait if Muslim or Trait faith warrior.png Warrior of the Faith trait if their Religion is any other. In addition, if the character had the  Excommunicated trait, it is removed.

Directed great holy wars[編集]

Directed Great Holy Wars can be declared by Temporal Heads of Faith. If victorious, the Kingdom is granted to the Head of Faith. Rulers of the same Faith can join forces with the Head of Faith, and based on their War Contribution, may gain Piety or Titles in the conquered Kingdom if victorious.

Undirected great holy wars[編集]

Undirected Great Holy Wars can be declared by Spiritual Heads of Faith. When declared, a preparation phase starts, during which Rulers of the attacking and defending Faiths can either donate gold or pledge military support to their side.

Each Undirected Great Holy War will have a War Chest, to which characters of the attacking Faith can donate  Gold in order to receive  Piety equal to half of the amount donated. Donating significant amounts will also grant bonus  Opinion with the Head of Faith. When the preparation phase ends, 20% of the War Chest's value will be divided among all rulers who pledged military support for the attacking Faith. The rest will be divided among all rulers who pledged military support if their Faith wins.

During the preparation phase, characters belonging to the Faith of the attacker or the defender can pledge military support. Characters who pledge military support may gain a share of the War Chest's value and will end all wars against characters who also pledged military support. Characters of the attacking Faith who pledge military support can also choose a Beneficiary, a character of their Dynasty who will receive titles in the targeted Kingdom proportional to their War Contribution. Upon pledging, characters of the attacking Faith will gain Piety and the War Chest will gain Prestige and Piety depending on their Primary Title rank:

Rank Piety War Chest Prestige War Chest Piety
Baron 30 250 75
Count 60 500 150
Duke 90 1000 300
King 120 1500 600
Emperor 150 3000 1200

A character can withdraw their pledge for military support after making it, but doing so will cause them to lose one Level of Devotion.

In addition, during the preparation phase, characters who pledged military support can spend Piety to change the targeted Kingdom.

Once the Preparation Phase ends, the war starts if the projected attacker strength is not 33% lower than the projected defender strength. If the attackers are victorious, the Kingdom is granted to the attacker that had the highest War Contribution. During both war and the preparation Phase, attackers may donate Gold to the War Chest.

Unlocking Great Holy Wars[編集]

Each faith has to unlock the great holy wars before it can declare them. To be eligible, the faith must have the right doctrines, its head must exist and not be imprisoned, there must be at least 35 counties in the world following the faith, and at least ten years must have passed since another faith unlocked great holy wars. Additionally, there are requirements based on year and lost holy sites, according to the table:

Faith Minimum year Condition
Catholic 1095 Top liege of Jerusalem is not Christian
Catholic 1000 Byzantine emperor or top liege of any of these counties is not Christian: Ankyra, Athens, Constantinople, Corinth
Catholic 800 The top liege of any of these counties is not Christian: Cologne, Halberstadt, Paris, Provence, Toulouse
Catholic - Top liege of Rome is not Christian
any faith 1100
any faith 800 Any two holy sites are in a realm whose top liege is not of this religion
Islam - After Christianity has unlocked, and any holy site is in a realm whose top liege is not Muslim
any faith - After both Christianity and Islam have unlocked, and any holy site is in a realm whose top liege is not of this religion


Raiding is the process of attacking the Holding of another character without requiring to be at war with them in order to gain Loot. In order to Raid, a ruler must be of either unreformed Pagan religion or Tribal government. Once a Holding has been Raided it cannot be Raided again by the same enemy for 5 years, during which time the Holding will have -50% Taxes, +50% Building Construction Time and -10% Development Growth. If the raided Barony is a Ruler's Realm Capital, raiding may capture or kill courtiers or family members. Holdings that have been Raided will have a torch icon above them when a raider army is selected.

Raiding is done via Raiders, armies raised in owned provinces for the purpose of Raiding that can carry loot based on the army size. Raiders cannot embark unless their culture has unlocked either the Longships or the West African Canoes Innovation. While Raiding, the army cannot move, allowing the attacked character to raise an army against the raiders if possible. If a Raider army is defeated before returning inside its own borders all Loot will be recovered.

If a Commander has raided at least 20 times, each raid has a chance to grant them the Trait viking.png Raider trait equal to the amount of times they raided.

If the Liege is the army's Commander after the Holding is raided, there is a 30% chance they will gain the option to sack its County. The chance is increased to 50% if the Liege has the Trait viking.png Raider trait.

Sacking the County presents at least one, sometimes two options. A player can always sack for additional treasure, granting more  Gold and  Prestige while the County will gain -40  Development Progress. When sacking a feudal or clan barony, if one’s capital has under 15  Development, they are also presented with a second option to capture slaves for their capital. Choosing this option will increase  Development progress in the raider’s capital by +40, decrease the sacked county’s development by -1, and decrease sacked county’s development progress by -80. Capturing slaves is perhaps the fastest way in the game to increase development, but can only be done in your capital county up to development 15.

Choosing either option will also give the County the Recently Sacked modifier for 20 years, which prevents it from being sacked again and gives it +20 Popular Opinion. Sacking a County will grant +10  Stress if the character has the  Compassionate or  Forgiving traits.

Maintenance cost for armies raised as raiders is reduced by 50%.

Raided rulers gain a decaying -15  Opinion towards the owners of the raiding armies.


A map showing each type of terrain in Crusader Kings III.

Each Barony has a dominant terrain. The terrain determines the movement speed and combat width in the Barony and can affect the supply limit and development growth in its County. It may also determine which buildings may be built in a county. There are 14 different terrain types in the game:

Terrain Movement Speed Combat width.png Combat Width Defender Advantage County Supply Limit County Development Growth Other effects
Terrain desert.png Desert 70% 100% −30% −50%
Terrain desert mountains.png Desert Mountains 50% 50% +12 −60% −50% −30% Defender Retreat Losses
Terrain drylands.png Drylands 100% 100% −5%
Terrain farmlands.png Farmlands 100% 100% +50% +20%
Terrain floodplains.png Floodplains 100% 75% +35% +20%
Terrain forest.png Forest 80% 90% +3 −10%
Terrain hills.png Hills 80% 80% +5 −10% −10%
Terrain jungle.png Jungle 50% 70% +6 −25% −40%
Terrain mountains.png Mountains 50% 50% +12 −50% −25%
Terrain oasis.png Oasis 100% 100% +10% +10%
Terrain plains.png Plains 100% 100%
Terrain steppe.png Steppe 100% 100% −50%
Terrain taiga.png Taiga 80% 80% +4 −20% −5%
Terrain wetlands.png Wetlands 70% 60% +5 −25% −25% +25% Retreat Losses
+20% Fatal Casualties