There is a curious apocryphal story that Berwick is (or recently was) technically at war with Russia.
The story goes that since Berwick had changed hands several times, it was traditionally regarded as a special, separate entity, and some proclamations referred to "England, Scotland and the town of Berwick-upon-Tweed". One such was the declaration of the Crimean War against Russia in 1853, which Queen Victoria supposedly signed as "Victoria, Queen of Great Britain, Ireland, Berwick-upon-Tweed and all British Dominions". However, when the Treaty of Paris (1856) was signed to conclude the war, "Berwick-upon-Tweed" was left out. This meant that, supposedly, one of Britain's smallest towns was officially at war with one of the world's mightiest powers– and the conflict extended by the lack of a peace treaty for over a century.