CK3 DatabaseCrusader Kings III · 1.20.0.3 “Crozier” · unofficial

Casus belli · Event wars

Invasion

Invasion is a casus belli in Crusader Kings III (event wars). If the attacker wins: The attacker seizes the Kingdom of England and personally takes all titles in southern England. If the defender wins: The defender keeps the Kingdom of England. The attacker loses their Claim to it. The war goal is worth 80% war score. Patch 1.20.0.3, from game/common/casus_belli_types/00_event_war.txt.

Quick answers (2)
What do you get for winning a Invasion war in CK3?
The attacker seizes the Kingdom of England and personally takes all titles in southern England (patch 1.20.0.3).
What happens on a white peace?
The defender keeps the Kingdom of England. The attacker's Claims become Pressed.

How the war ends

Attacker wins

The attacker seizes the Kingdom of England and personally takes all titles in southern England.

White peace

The defender keeps the Kingdom of England. The attacker's Claims become Pressed.

Defender wins

The defender keeps the Kingdom of England. The attacker loses their Claim to it.

If the war becomes invalid

The … has ended: the defender no longer … any of the claimed Counties.

Who can declare it

The game shows no text of its own for these conditions; the script is below.

Every event wars war (the group's allowed_for_character) (1 line of game script)
herders_and_tributary_constraints = yes

As written in game/common/casus_belli_groups/00_casus_belli_groups.txt.

Defender (allowed_against_character) (1 line of game script)
faith.religion = scope:attacker.faith.religion

As written in game/common/casus_belli_types/00_event_war.txt.

Source: game/common/casus_belli_types/00_event_war.txt and the English localisation, Crusader Kings III 1.20.0.3. “The attacker”, “the defender” stand where the game names the character; “…” marks other words it fills in during play.