Bava entered production when it was already falling apart and re-wrote and shot the film in six days.
Knives of the Avenger was a troubled production originally directed by Leopoldo Savona.
It received a theatrical release in the United States in January 1968.
[1] Knives of the Avenger was released on DVD by Image Entertainment on 26 June 2001.
[4] Stuart Byron of Variety declared the film "a real surprise: a beautifully designed and exciting Viking tale from pseudonymous Mario Bava.