Throughout the entire Second World War Polish museum staff, archivists, and librarians attempted to gather information about the plunder of cultural property carried out by the German occupation authorities. Data pertaining to the outcome of this campaign, the persons involved in it, and the destinations of the art, library, and archive collections reached a special cell of the Polish government-in-exile in London. The documentation amassed in this manner became an important element of the revindication undertaken by the officials of the Ministry of Culture and Art several months prior to the end of the war. Owing to information indicating that a large part of the collections had been taken to Lower Silesia, already in February 1945 attempts were made to reach the terrains of this former German province seized by the Red Army and to initiate a search for plundered cultural property. This initiative could not be realised, however, due to the still existing threat of wartime hostilities and the activity of Soviet detachments dealing with the repossession of “post-German” property (i.a. museum collections). Not until May 1945, when Polish administration assumed authority in Lower Silesia, did the museum staff, archivists, and librarians gain an opportunity for embarking upon a recovery campaign. The information gathered for years proved extremely valuable, making it possible to discover successive storehouses containing loot removed by the German occupation authorities from Poland. In the course of several years, numerous works of art, archive material, and library collections were recovered in Lower Silesia. A report made by the Office of Recoveries and Reparations, which coordinated this operation at the end of the 1940s, includes information indicating that 29 train carriages and 118 lorries containing cultural property plundered from Polish collections left Lower Silesia in 1945–1950.