The Pirate of the Black Hawk (1958)

So vast it sweeps all before it!

Manfred, backed by Saracen pirates, deposes the Duke of Montfort, takes over the throne and kidnapped the Duke's young son. Capt. Riccardo, the leader of a pirate band on the ship Black Hawk, sets out to defeat Manfred and his Saracens and restore the Duke to his rightful place on the throne.