– not knowing of the restricted mandate – resigned for the Polish-held parts of the Archdiocese, but not for the remaining parts in Czechoslovakia and Allied occupied Germany. Hlond divided the Polish-held area of the ecclesiastical province into four apostolic administrations of Gorzów Wielkopolski, Olsztyn, Opole, and Wrocław proper and appointed a diocesan administrator for each of them on 15 August, with effect of 1 September. Capitular Vicar Piontek confirmed Onderek on 18 August 1945 as vicar general for the Czechoslovakian part of the archdiocese. Piontek was asked to help Karol Milik, the new administrator in Wrocław, and stayed. He could also take care of the Catholic clergy and laymen of German language, who were in the course of expulsion in accordance to the Potsdam Agreement by the Soviet-installed communist authorities. Pope Pius XII did not recognise Hlond's overbearances. In order to strengthen Piontek's position Pius XII granted him the rights of a residing bishop on 28 February 1946. However, on 9 July the Polish authorities expelled Piontek and he was stranded in Peine, then British zone of occupation. On 31 July Pius XII confirmed Onderek's appointment and advanced him to Apostolic Administrator of the Czechoslovak part of the Archdiocese of Breslau (), seated in Český Těšín, thus definitely divesting it from Breslau's jurisdiction. The East German Ecclesiastical Province of Breslau remained in existence de jure; however, de facto this only applied to the archdiocesan territory in the Allied Occupation Zones in the remainder of German post-war territories. This also included big parts of the suffragan diocese of Berlin, except for its areas east of the Oder-Neisse line. However, the territory of the other suffragans and the Territorial Prelature of Schneidemühl/Piła had come under Polish or Soviet rule. In 1947 Piontek returned to the archdiocesan territory west of the Oder-Neisse line (then part of Soviet occupation zone) and officiated as capitular vicar at the local branch of the archdiocesan ordinariate in Silesian Görlitz, built up since October 1945. Despite the anticlerical Soviet policy he managed to build up a new seminary in Neuzelle in 1948, after the old seminary in Poland was inaccessible for candidates from west of the new border. In 1953 Pius XII invested Piontek with the right to bear a crosier and bestow episcopal blessings. On 23 May 1959 Piontek became titular bishop of Barca. The Holy See refused to acknowledge Polish Catholic Church claims, however, and