The essay introduces a document written by the Czechoslovak army counter-intelligence. It concerns the poor condition of Czechoslovak-Polish relations in spring 1946 and criticises the conduct of particular Czechoslovak policymakers. It draws attention to the goodwill of Polish high political circles to reach agreement with Czechoslovakia. Enclosed, there is a document compiled by the Office of the Prime, which argues with the conclusions of the counter-intelligence. The two documents pose not only an important source of information on the condition of Czechoslovak-Polish relations, but also reflect the growing intensity of interior political hassle in contemporary Czechoslovakia. The essay is appended with an introductory study commenting on Czechoslovak-Polish relations in 1946.