 Besides Marx and Engels, other frequent contributors to the "Neue Rheinische Zeitung" included Karl Schapper, Wilhelm Wolff, Ernst Dronke, Peter Nothjung, Heinrich Bürgers, Ferdinand Wolf and Carl Cramer.Friedrich Engels's mother, herself, gives unwitting witness to the effect of the "Neue Rheinische Zeitung" on the revolutionary uprising in Cologne in 1848.Criticising his involvement in the uprising she states in a 5 December 1848 letter to Friedrich that "nobody, ourselves included, doubted that the meetings at which you and your friends spoke, and also the language of "(Neue) Rh.Z."