Red Shadows by Robert E. Howard

Limbs and vines slapped against Kane's face. The oppressive steam of the tropic night rose like mist about him. The moon, now floating high above the jungle, limned the black shadows in its white glow and patterned the jungle floor in grotesque designs. Kane knew not if the man he sought was ahead of him, but broken limbs and trampled underbrush showed that some man had gone that way, some man who fled in haste, nor halted to pick his way. Kane followed these signs unswervingly. Believing in the justice of his vengeance, he did not doubt that the dim beings who rule men's destinies would finally bring him face to face with Le Loup.

Behind him the drums boomed and muttered. What a tale they had to tell this night! of the triumph of N'Longa, the death of the black king, the overthrow of the white-man-with-eyes-like-a-leopard, and a more darksome tale, a tale to be whispered in low, muttering vibrations: the nameless ju-ju.