The remembrance of a historic role as "the shield of Christianity" against a terrible pagan enemy, performed without the aid of Christian Austrians, Hungarians, Italians or Balkan neighbors, and often performed while being stabbed in the back by them, informs the mutual enmities of the present. The Serbian militiaman raping Muslim women and murdering Muslim men in Bosnia-Herzegovina today sincerely believes he is avenging the injustices inflicted upon his nation 600 years ago. The Greek patriot who shouts that "there is only one Macedonia and that is in Greece" (rather than in the former Yugoslavia) is likewise purportedly defending the cultural heritage of Alexander the Great against rude and uncouth Slavic invaders. (Never mind that the Slavs have themselves been living in the region for some 1,300 years.) Mr. Kaplan spares no individual and no nation in his indictments ...