Campaign

[F9] Create a battle from one of your king's empires to attack an adjacent map card. Diagonal counts. Color is irrelevant.

Attackers: You must pay 1 florin to China for each of your attackers.

Defenders:

A battle is fought. If you win, the defending empire has a regime change. You claim the defender as a vassal to your winning king. Discard all queens and vassals of the defeated empire, but keep any bishop. All repressed tokens remain repressed on the vassal unless you choose to emancipate them in the regime change.

No tokens move from the conqueror to the victim.
There is no regime change if a suzerain attacks their vassal or a vassal attacks a sister vassal.
If a vassal wins a campaign, the conquered empire joins the attacker's suzerain as a vassal.
A vassal may not attack their suzerain.