The Fiercest Heart is a 1961 American adventure film in CinemaScope and Color by De Luxe starring Stuart Whitman and Juliet Prowse, also featuring 1960 Summer Olympics decathlon champion Rafer Johnson.

Bates and his fellow escapees, his African friend Nzobo and a brutal criminal, Harry Carter, help hold off a raid by Zulu warriors, but Prinsloo is badly wounded.

To the fury of Barent Beyer, a man who loves Francina, her grandfather's last wish before he dies is that Bates now become the group's leader.

The jealous Barent sets an ambush to kill Bates, but before he can, he is felled by a Zulu spear.

What remains of the group is able to go back to Francina's farm in peace after the Zulu chief is killed in battle by Nzobo.