Revalidating in the first world war, German wounded war flyer Peter Bender, as the story goes, came across some hollow earth pamphlets by Koresh and became illuminated.
After the war, Bender visited Karl Neupert, after which Neupert would become a tireless advocate of Bender's and Koresh's theories.
This resulted in amongst others this pamphlet that Neupert wrote and which was published in 1928: Umwalzung, Der Kampf gegen das Kopernikanische Weltbild (Revolution, The Battle against the Copernian Worldview).