Hahn also included a description of the Etosha pan and collected animal specimens for the Natural History Museum, Berlin. A shortage of missionaries stymied the Rhenish Missionaries in Ovamboland, and Hahn himself returned to Germany in June 1859 to escape the Nama-Herero war, finding friends and support for the Rhenish Missionaries on a whirlwind tour of Germany, England, and Russia.
Hahn documented the Etosha pan and collected animal specimens for the Natural History Museum in Berlin. A lack of missionaries hindered the Rhenish Missionaries in Ovamboland, prompting Hahn to return to Germany in June 1859 to escape the Nama-Herero conflict. He found support for the Rhenish Missionaries during a whirlwind tour of Germany, England, and Russia.