Gaceta Renana
In 1911, Sollmann became editor of the socialdemocratic newspaper "Fränkischer Volksfreund" at Würzburg, but soon returned to Cologne where he became editor (1912) and later editor-in-chief (1920–33) of the "Rheinische Zeitung". During World War I, Sollmann was the chairman of the socialdemocratic union ("Verein") of Cologne.