Arriving at Field Marshal Bernard Montgomery's headquarters in Lüneburg, Germany he was informed that an unconditional surrender to all Allied forces was necessary and not negotiable. Upon receiving permission from Dönitz, he signed an instrument of surrender of all German armed forces in the Netherlands, northwest Germany and Denmark on 4 May 1945. On 7 May 1945, he was present at the first signing of the German Instrument of Surrender by General Alfred Jodl in Reims.