 The official historians wrote that the transfer of production to the Harz mountains and testing to Poland must have caused some delay in remedying the numerous design failings of the device and that the killing of Thiel and Walther might have made things worse.The attack on Peenemünde and other sites might have delayed the V2 offensive by two months.Although research and development continued almost immediately and test launches resumed on October 6, plans for some German V-2 facilities were changed after Hydra; the unfinished production plant for V-2s was moved to the Mittelwerk.