Crusader Kings 3: Complete Guide To Warfare
Wars were common in the Middle Ages, and Crusader Kings 3 is no different. The battlefield is often the most expedient means of getting your way, despite the risks and expense. A well-planned and well-executed war can see your realm expand tremendously, or even put a crown on your head.
Related: Crusader Kings 3: Best Ways To Increase Prestige
Warfare is more complicated in Crusader Kings 3 than in most other games, but once you get the hang of it you'll be able to press your claims like a pro. In the meantime, here's everything you need to know about declaring, waging, and winning wars.
Characters in Crusader Kings 3 can't just declare war whenever they like. Before you can initiate a conflict, you'll need an appropriate casus belli, a Latin phrase meaning "cause for war." Wars have to be justified in Crusader Kings 3, and your casus belli determines what you're fighting for and what you'll get if you win.
The most common types of casus belli are those that allow you to press a claim on land you do not control. It doesn't have to be one of your own claims - you can start a war on behalf of anyone in your court, including guests. All of a character's claims can be viewed by clicking on their portrait.
Claiming land on behalf of someone else will not usually expand your realm unless the claimant is already a landed vassal under you. It can still be useful to prop up a pretender, even if you don't directly benefit; you might seize land on behalf of a relative to improve your Dynasty, or simply replace a rival neighbor with someone more cordial to you.
You can also wage war for land that is legally part of your domain but held by someone else. For example, if you're the King of England, but York is held by someone else,
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