In 1648 and during the Second English Civil War, the parliamentarians of Oliver Cromwell cornered the monarchists in the Isles of Scilly, off the coast of Cornwall, where they survived largely thanks to boarding Dutch ships, allies of parliamentarians. As a result, the Netherlands declared war on the rebels, who surrendered to Cromwell in 1651, so that the Dutch could withdraw victorious without the need of firing a single shot. Of course, they forgot to sign a peace agreement, which was not done until April 17, 1986, so this war without casualties lasted 335 years. By the way, technically World War II is not over either. Japan and Russia should also sign a peace treaty.