Borkovský's discovery of the Prague Castle skeleton led to conflict with German occupying forces during the Second World War who were keen to find evidence of early German involvement in the region. Under threat of being sent to a concentration camp Borkovský was forced to issue a paper identifying the skeleton as of Germanic origin and to withdraw a book publicising early Slavic pottery from the area. After the war he came under suspicion from Soviet forces for his pro-German interpretation and, after being spared from being sent to a gulag, issued a paper retracting his earlier interpretation and describing the skeleton as a Slav.