If you haven't seen it already, I would recommend "The Chosen"! The first episode of Season 2 can be viewed by clicking here!
The Nuttall Encyclopedia
See Königgrätz .
Wood, James, ed. Entry for 'Sadowa'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/s/sadowa.html. Frederick Warne & Co Ltd. London. 1900.