Jack,
As you know the Brits were attacked by Osman Digna's Hadendoah Beja at the Battle of Tofrek. Other than kaskara they likely used the knives shown in the attached link during the battle. The hooked type was used on foot and very effective against cavalry by cutting ankles and legs and/or reins and in general close combat.
http://www.vikingsword.com/vb/showthread.php?t=13060
Take care,
Ed