Takamoto: "We started a war on Otomo, who just bought our infinite military access... and they don't care? Why is this happening?"
Motnari: "Because we ony help Shoni to fight them. We did not declare war on them."
Takamoto: "But we did declare war on them?"
Motonari: "Don't you get it? We did not!"



Note: It seems that as long as ANY clan (say clan A) is at war with any other clan that is NOT currently our enemy (clan B), we can declare war on clan A without any kind of punishment, by asking clan B to allow us to help in their war. And we usually get paid by clan B as well!