Why was part of the Ruhr Valley called " Miniature England "
Red Ruhr Army was an army of between 50,000 and 80,000 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 in the Ruhr Valley on 13 March 1920 as a reaction to the Kapp Putsch , the richest industrial area of Germany .