The Three Hundred and Thirty Five Years’ War was an alleged theoretical state of war between the Netherlands and the Isles of Scilly (located off the southwest coast of Great Britain).
The truth of this war ever existing is disputed. It is said to have been extended by the lack of a peace treaty for 335 years without a single shot being fired, which would make it one of the world’s longest wars and a bloodless war. Despite the uncertain validity of the declaration of war, and thus uncertainty about whether or not a state of war ever actually existed in the first place, peace was finally declared in 1986, bringing an end to any hypothetical war that may have been legally considered to exist. If accepted as a war, it would be one of the world’s longest ever wars.