I'm not all that sure about the Andorran peace treaty story. I've googled and only found it mentioned on "wacky story" sites. I couldn't turn up any reference to an actual treaty even though I had a specific date (25 September 1939) to work from. Since Andorra only became independently sovereign in 1993, it seems unlikely that it had actually declared war on Germany during World War I, though I suppose you never know. If there is any truth in this at all, one possible way in which it might have come about is because prior to 1993 reponsibility for Andorra's affairs alternated (annually I think) between French and Spanish authorities. It is possible that Andorra might have been administratively French when France went to war in 1914 and Spanish when the Treaty of Versailles was signed. Just a guess though. There's a lot of factual stuff about Andorra here: