I liked it only because I fancy swords and medieval armor. However, you're not going to learn anything factual nor fascinating about medieval combat here unlike in Robert Taylor's Ivanhoe or Knights of the Round Table.
The character portrayed by Alan Ladd wears an abbreviated armor eschewing the greaves and other gear to protect the legs and arms. Save for the breastplate and chain mail (short sleeved at that!), there is little to suggest that he wears authentic knightly armor. Even his helmet covers only the top of his face (no doubt to display his handsome features.) Robocop is the same way. The reason for the light armor becomes apparent when Ladd performs acrobatics in combat unlikely to have been part of a knight's dueling or battle paces. Robert Wagner in Prince Valiant does similar things.
The heroic Black Knight is actually a commoner and thus barred from bearing knightly arms and so has to keep his identity secret.
The villains are a Saracen knight (Peter Cushing) allied with Cornishmen. Why the people of Cornwall who are as British as the English? Beats me.
Cushing gives a luscious performance as a baddie. His quip after humiliating the blacksmith Alan Ladd before his lady love (Patricia Medina) is memorable. After failing to egg the meek Alan Ladd into fighting him, he turns to Patricia saying: "Please pardon this shameful exhibition."
The photography and location shots are excellent.
