Following the armistice with Germany in November 1918, the majority of the High Seas Fleet was to be interned in the British naval base at Scapa Flow. "Bayern" was listed as one of the ships to be handed over, though "Baden" initially was not. The battlecruiser , which the British believed to be completed, was requested instead. When it became apparent to the Allies that "Mackensen" was still under construction, "Baden" was ordered to replace it. On 21 November 1918, the ships to be interned, under the command of Rear Admiral Ludwig von Reuter, sailed from their base in Germany for the last time. The fleet rendezvoused with the light cruiser , before meeting a massive flotilla of some 370 British, American, and French warships for the voyage to Scapa Flow. "Baden" arrived at Scapa Flow separately on 14 December 1918.