Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Red Ruhr Army was an army of 50,000 left wing workers from the Communist Party of Germany, the Communist Workers'' Party of Germany, the Independent Social Democratic Party of Germany, and the Free Workers Union of Germany, formed on March 13, 1920 as a reaction to the Kapp Putsch in the Ruhr Valley, the richest industrial area of Germany. After calling a general strike on March 14, the Red Ruhr Army defeated the Freikorps and regular army units in the area and started the biggest armed workers'' uprising in Germany, also called Märzrevolution (March Revolution) and Ruhr Uprising (Ruhraufstand). While the bourgeoisie feared a left wing putsch, 300,000 mine workers supported the Ruhr Red Army. The strikers conquered Düsseldorf, Elberfeld, Essen and soon had control over the whole Ruhr area.