When Lufthansa gave back the ex-BC Alvensleven, now Transatlantikplattform Meerwein, the OKM had to make a decision about the worthy hull. Operation Sealion was to become reality next year and the Kriegsmarine was hastily building ships like never before, older ships were refitted to stand against the so said best navy in the world.
For a refit into a fullscale carrier there was no time, the hull contained only a third of its earlier enginepower. Half of the ship was fitted with a flight deck but the other half would have needed a complete rebuild.
So she was finally converted into a mobile starting platform for V1M missiles, the navalised and enlarged version of the V1. The concept was well tested with the cruiser Passau and the mobile airfield was the ideal source for a successful conversion.
The flightdeck was reduced to a helicopter landingdeck with hanger. The former repair facilites around the lift were removed for more storage. The big single catapult on the foredeck was replaced by two smaller ones. Some aa and directors were added, ready was the missilemonitor 'Baldur'. She was now able to store 60 V1M and every two minutes another pair of the could be fired. The ready-time for a V1M was eight minutes (fix wings, check electronics, carry it from the tracks to the catapult, finaly check, program target, final test and go), twelve could be carried ready.
'Baldur' had the speciol mission to attack the homefleet at Scapa Flow. In the night before the invasion she took position 90 miles east of Scapa Flow, one hour before sunrise the wrecking of homefleet began. Baldur managed to fire all 60 missiles until she was found by RN destroyers. But the ship was abandonded, the destroyers sank just an empty old wreck.