If the check six story is correct the German field from which Hoover stole the battle damaged 190 was abandoned by the Germans on 29th April and taken over by the Russians 2nd May, I doub't the Germans noted fastidious bookkeeping would have been a feature at that point in time on the poorly staffed airfield with the Soviets knocking on the door. Unable to find a date on which Hoover made the flight, obviously April as that's the month he escaped POW camp, any idea?