In 1803 he took over the editorship of two Halberstadt newspapers that had been founded by J.M.Lewian, a local Jewish businessman. One of these was the "Neuen Anzeigen vom Nützlichen, Angenehmen und Schönen", which he relaunched in 1804 with a shorter title as the "Neuen Anzeigen der Merkwürdigkeiten". The other was the "Allgemeinen Anzeigen der Merkwürdigkeiten", and he left this title unchanged. Raßmann edited both publications till the end of 1804. Alongside his editorial duties he found time to work as a "corrector" for the Döllschen Book Printing company, also in Halberstadt. It was on the recommendation of that Friedrich Raßmann moved to Münster, which in the context of the war had been under Prussian occupation since 1802. (The city came under the control of a French puppet state early in 1806.) Raßmann arrived in Münster and immediately took on the editorship of "Merkur", a journal published by Friedrich Theodor Schmölder. In February 1806 "Merkur" ceased publication. It is known from his correspondence that Friedrich Raßmann very frequently found himself short of money, especially during the war years: following the collapse of "Merkur" he was able to find work as a private tutor. The appearance of French troops on the city streets in the aftermath of the French military victory at Austerlitz, meant there was suddenly plenty of work for tutors of both German and French: it turned out that Raßmann was competent in both. During the decades that followed he increasingly supported himself through freelance writing work in German. The poetry also continued to flow.