Michener tells the story of Sobieski marching two days out of his way to make a pilgrimage to Czestehowa before saving Vienna. The Polish forces then rode behind the banner of the black madonna, the saviour of Poland.
If I remember the battle from the Michener novel, the Turks were using sappers from a European country to get under Vienna's walls. Anyone guess who the Muslims ally in that war? The first two guesses don't count.
I didn't know that, about the black madonna banner. Thanks for adding that. VERY cool. We just have to keep telling the wonderful history of Western Civ; the know-nothings abound.