From early to mid-1848, he participated as an expert in the economic committee of the Frankfurt National Assembly.
As Commissioner of Bremen he advised on German trade relations.
Subsequently, he was in July 1848 appointed Reich Minister for Trade (Reichsminister für Handel) of the all-Germany 'Provisional Central Power' (Provisorische Zentralgewalt), headed by Archduke John of Austria as regent (Reichsverweser).
He managed to create in a short time a small navy (Reichsseewehr or Reichsflotte) for limited use in the Second Schleswig War (1849) against the superior Danish fleet.
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