Fehrmann also climbed in the Alps and Dolomites, as well, creating new routes there. In 1908, he published a climbing guide for the sandstone spires near Dresden, his favorite area, entitled Der Bergsteiger in der Sächsischen Schweiz. Fehrmann joined the NSDAP in its early stages, and became a Party functionary. As a lawyer, he served during World War II as a military judge. He was able, during this time, to work out accessibility issues regarding the rocks along the Elbe, assisting the climbing community. He was captured at the end of the war and interned in an East German war prisoner camp, where he died a natural death at the age of 61 in 1947.