I am playing as chosokabe at round 24. I have 3 provinces and a commercial agreement with the miyoshi clan in the western part of my island.
I declared war to the Ouchi clan landed an army on their province of Suo. They have 3 provinces and are allied with the Otomo Clan that only hold the Buzen province.
After 1 turn with my army in the main island it was automatically moved back to my home island due to 'Tactic retreat' or something like that (Unfortunately I cannot find the message again), mentioning something about a decision of the dominant clan. Would anyone explain me why this happened?