Restoring the texture of Renegade Knights from Hammers of Fate.

Please check if you haven't mixed up the IDs, as I already mentioned, there are several for the same hero. It seems very likely that you assigned the geometry ID from the hero's window to the ID for the world map.
Also, try moving all the files associated with this hero from the Fortress folder to the Tribes of the East\Characters\Heroes folder. (Pay attention to the fact that their names should match and they should be replaced, as their names may have changed in Tribes of the East).