Ambreville
Deity
Well, I have already added in home country navies. So the King's fleet will be seen moving in the vicinity of your cities. These units will protect you against pirates, but they will also stop any of your ships carrying illegal cargo. The two main types of illegal cargo are dependent upon your country's civics, and they include: Slaves and foreign goods.
Not that I think more really needs to be added as regard naval warfare, but what I was suggesting was using corsairs on European coasts against one's original liege, such as John Paul Jones operating from French ports against English interests. I couldn't see how your answer addressed my point.