 Such "extended wars" are discovered much after the fact, and have no impact during the long period (often hundreds of years) after the actual fighting ended.The discovery of an "extended war" is sometimes an opportunity for a friendly ceremonial peace to be contracted by the belligerent parties.Such peace ceremonies are even conducted after ancient wars where no peace treaty was expected in the first place, and in cases where the countries weren't even at war at all, such as the case of Berwick v Russia.