all in word and deed". Pacelli was appointed Apostolic Nuncio to Germany on 23 June 1920, and—after the completion of a Bavarian concordat—his nunciature was moved to Berlin in August 1925. Many of Pacelli's Munich staff stayed with him for the rest of his life, including his advisor Robert Leiber and Sister Pascalina Lehnert—housekeeper, cook, friend, and adviser for 41 years. In Berlin, Pacelli was Dean of the Diplomatic Corps and active in diplomatic and many social activities. He was aided by the German priest Ludwig Kaas, who was known for his expertise in Church-state relations and was a full-time politician, politically active in the Catholic Centre Party, a party he led following Wilhelm Marx's resignation in October 1928. While in Germany, he travelled to all regions, attended Katholikentag (national gatherings of the faithful), and delivered some 50 sermons and speeches to the German people. In Berlin he lived in the Tiergarten quarter and threw parties for the official and diplomatic elite. Paul von Hindenburg, Gustav Stresemann, and other members of the Cabinet were regular guests. In post-war Germany, in the absence of a nuncio in Moscow, Pacelli worked also on diplomatic arrangements between the Vatican and the Soviet Union. He negotiated food shipments for Russia, where the Catholic Church was persecuted. He met with Soviet representatives including Foreign Minister Georgi Chicherin, who rejected any kind of religious education, the ordination of priests and bishops, but offered agreements without the points vital to the Vatican. Despite Vatican pessimism and a lack of visible progress, Pacelli continued the secret negotiations, until Pius XI ordered them to be discontinued in 1927. Pacelli supported German diplomatic activity aimed at rejection of punitive measures from victorious former enemies. He blocked French attempts for an ecclesiastical separation of the Saar region, supported the appointment of a papal administrator for Danzig and aided the reintegration of priests expelled from Poland. A Prussian Concordat was signed on 14 June 1929. Following the Wall Street Crash of 1929, the beginnings of a world economic slump appeared, and the days of the Weimar Republic were numbered. Pacelli was summoned back to Rome at this time—the call coming by telegram when he was resting at his favourite retreat, the Rorschach convent sanatorium. He left Berlin on 10 December 1929. David Dalin wrote "of the forty-four speeches Pacelli gave in Germany as papal nuncio between 1917 and 1929, forty denounced some