Dark of the Sun (1968)

IMDB
Genre : Action, Adventure, Drama, Thriller, War
TRAILER
Director : Jack Cardiff
Stars : Rod Taylor, Yvette Mimieux, Peter Carsten, Jim Brown
Plot : A band of mercenaries led by Captain Curry travel through war-torn Congo across deadly terrain, battling rival armies, to steal $50 million in uncut diamonds. But infighting, sadistic rebels and a time lock jeopardize everything.