I didn't see any "claim of voodoo-like practices by Germans" in this thread which could be attributed to Poland as a country, and many of our readers may not have seen it either. One doesn't have to study ignorance to recognize such claims as familiar propaganda devices, employed by the NS-regime and the governments of numerous other countries at various times to excite public opinion. The intelligent reader has to examine this sort of allegation with care, because of the large number of frauds and hoaxes associated with claims of this character.
Here is the source again:
http://digicoll.library.wisc.edu/cgi-bi ... 01&isize=M
As you will see, the source is the official US Government publication "Foreign Relations of the United States", so unlikely to be a fraud or hoax (except to the extent that the State Department of the United States engages in frauds and hoaxes).
The document in question, starting on page 374 and continuing on page 375, is a report from US Ambassador Biddle in Warsaw to the State Department, sent at 4:00 PM on 26 August 1939, describing a meeting with Polish Foreign Minister Beck.
The relevant section is paragraphs 4 and 5 on page 375. In paragraph 4, Biddle addresses the issue of German accusations of Polish atrocities against the German minority in Poland, and dismisses them as gross exaggeration, giving an example of such an exaggeration.
Then in paragraph 5, Biddle makes this claim:
5. If Nazi treatment of Polish soldier killed on August 16 on Danzig-Polish frontier could be regarded as example of current day German methods then we may expect any Polish-German hostilities to involve frightful atrocities. (Official autopsy disclosed soldier's stomach had been ripped open and filled up with many extraneous articles of revolting character including a baby's skull).
Note that Biddle in no way questions the veracity of the alleged "official autopsy" that is supposedly the basis of the Polish claim of a voodoo-like action by Germans; he simply wonders whether it is typical of German methods.
I invite members of the Forum and Forum staff to confirm explicitly whether they believe the claim that Germans killed a Polish soldier on the Polish-Danzig frontier, ripped open his stomach and placed a child's skull inside it along with other objects of a revolting character.
If they do not believe it, I would ask them whether they agree that this lurid Polish claim indicates that the Polish side engaged in atrocity propaganda every bit as exaggerated as that disseminated by the German side.