The activity of the Polish military Intelligence in Eastern Prussia in the years 1981-939 should be assessed by taking into consideration the following issues: the participation of the Second Department in the plebiscite campaign, the Intelligence work conducted by local branches of the Second Department, and the construction and support of Polish minority organisations envisaged as a foundation for diversion structures. The Polish military did not remain passive towards the plebiscites conducted in Warmia, Mazuria and the Powisle region (part of Gdansk Pomerania). Nonetheless, the undertakings were initiated too late, insufficiently vigorously and without a clear programme. The subsequent efforts of the Second Department in relation to the population of Mazuria, aimed at awakening national consciousness and the creation of diversion measures, ended with a fiasco. On the other hand, one of the successes of Intelligence reconnaissance in Eastern Prussia, i. a. on the eve of the Second World War, included the establishment of the dislocation of an overwhelming majority of the German units.
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