Flensburg Government
In the Second World War the "Reichspost" authority spread out to the Polish areas annexed by Nazi Germany, such as the "Reichsgau Wartheland", the "Reichsgau Danzig-Westpreußen", and the Polish General Government. In 1941 postal codes were introduced. The "Feldpost" military mail organisation of the Wehrmacht not only served Army, "Luftwaffe" and "Kriegsmarine" service members, but also "SS-Verfügungstruppen", "Waffen-SS" and "Reichsarbeitsdienst" members in the field, becoming the general postal authority of the occupied territories. Deliveries were more and more affected by the advance of Allied troops from January 1945 on. The Reichspost finally ceased to function with the German Instrument of Surrender on May 8. The last "Reichspostminister" Julius Dorpmüller, a member of the Flensburg Government, was arrested two weeks later, and governmental authority was officially taken over by the Allied Control Council with the Berlin Declaration of June 5.