I distrust anything from history books, but there were papal encyclicals condemning the evils of the Reich government and of Communism. So I consider those to be enemies of God during WW2. There may be others but these ones I am sure about.
I counter that Hitler was not even close to being as evil as Stalin, Roosevelt or Churchill. Understand the effects of the Treat of Versailles and the influence of the jews and you will understand why Hitler brought Germany prosperity and certainly did not mass murder the jews.
Ask yourself what war in the last 500 years would be considered a just and moral war in the Catholic sense?