Playing as England and want to conquer the remaining French lands (about four provinces). Problem is that France is in a PU under Spain. It seems like I can declare war on France, which I wasn't too sure about. Just wondering do I have to kick Spain's ass in order to annex the French lands, since they are the senior partner in the PU, or is it enough to beat France to 100% warscore and eat them?
My plan was to concentrate against France in the north and use a defensive screen against Spain in the south.
Is this feasible?