Polish Military Organization of the Upper Silesia was a secret military organization formed in February 1919 in Upper Silesia

Upper Silesia

Upper Silesia is the southeastern part of the historical and geographical region of Silesia. Since the 9th century, Upper Silesia has been part of Greater Moravia, the Duchy of Bohemia, the Piast Kingdom of Poland, again of the Lands of the Bohemian Crown and the Holy Roman Empire, as well as of...

. It was involved in the three Silesian Uprisings

Silesian Uprisings

The Silesian Uprisings were a series of three armed uprisings of the Poles and Polish Silesians of Upper Silesia, from 1919–1921, against German rule; the resistance hoped to break away from Germany in order to join the Second Polish Republic, which had been established in the wake of World War I...

, although officially it was disbanded after the Second Uprising. It had over 20,000 members, including Alfons Zgrzebniok, Jan Wyglenda, Walenty Fojkis, Karol Grzesik, Rudolf Kornke, Wolfgang Kornke, Maksymilian Iksal.