Medal is in fantastic shape for it’s age! For volunteers, the qualifying period was two months and for auxiliary units 5 months. There was no qualifying minimum period of service for those wounded in the conflict. The Polish-Soviet war of 1918 to 1921 arose from the chaos at the end of World War I and the Russian Revolution of 1917, with Poland seeking to reinforce its independence after centuries of occupation and division and expand its frontiers eastward and Soviet forces attempting to take control of former Imperial Russian territories. The Treaty of Riga that ended the war in 1921 effectively divided the disputed area between the two combatants. Please feel free to ask questions and make an offer! This medal is from the esteemed collection of Allan Zakrzewski, WWI historian, member of Cross and Cockade International and Orders and Medals Society of America. He was also a Charter member of The League of World War One Aviation Historians. In 2001, he became an editor for Over the Front quarterly magazine and while a member of the Gulf Cost Chapter of the League of WWI Aviation Historians, he earned the Thornton D. Hooper Award for Excellence for his article on Monoplane Fighters of World War I. In 2007, he received his second Thornton D. Hooper Award for An Evening with Rodney Williams, 17th Aero Squadron. Much of his collection is on display at the University of Texas at Dallas’ Eugene McDermott Library.