I just got this form another site. But, Andorra only became a sovereign nation in the 90s, so it may not be true...
The tiny nation of Andorra declared war on Germany in 1914 along with many other nations. However, the Versailles Peace Treaty failed to include the nation, and it remained at war with Germany throughout the 1920's and 30's. The country's army composed of 10 people, however, and it's military budget was 4 dollars per year for ceremonial blanks. The soldiers, however, wore pins reading "TOUCH ME IF YOU DARE", the country's national motto. In 1939, Andorra found itself involved in two world wars at once. A peace treaty was finally signed with Germany on September 25, 1939, during the invasion of Poland at the start of WW2. This document brought peace to the Andorrans for the first time in 44 years and officially ended the first world war