https://jueterbook.de/cat/militaria/kriegsgeschichte/book/photographic-history-of-the-civil-war--fort-sumter-to-gettysburg---shadows-of-the-storm---the-guns-of-62---the-embattled-confederacy-15831/book/revolution--re-vorhutparteien-in-asien-und-afrika--formierung-und-kampf--35438