Here is an interesting article from 1861 about the weapons "On the Arabs and Negro tribes of Central Africa" by John Petherick. Has some period sketches of spears and offers a context to the use of various weapons of that era. Some of his collection is shown on the Pit Rivers site.
If this link doesn't work check out him and the title on Google Books.
Better access. Vol. 4, p.171 of Royal United Services institute. 1861.
https://babel.hathitrust.org/cgi/pt?...iew=1up;seq=23
https://books.google.com/books?id=AE...Africa&f=false
Also, the Funj were the dominant kingdom from 1500 to 1821 from the Atbara River down the Nile tp well below the Blue Nile junction after the defeated the last Nubian Christian kingdom, Alodia, on the Nile. Alodia had its capital near Khartoum.
Check out "Abu El Kaylic, the Kingmaker of the Funj of Sennar", A. Robinson American Anthropologist, 1929, Vol. 31. No.2 p. 232-264. Good info on the Funj army of the time.
https://anthrosource.onlinelibrary.w...1433/1929/31/2
Best regards,
Ed