Mohammad Qasim Aurangabadi wrote an eye witness account of baba Banda Singh bahadur shaheedi.
book can be read at
http://www.sikhbookclub.com/Book/Ahwal-ul-Khawaqin-by-Aaurangabadi
Aurangabadi uses harsh words for Sikhs but ultimately praises them by saying "sikhan wargi kaum paida nahin hoyee".