This Sam Katzman production is actually pretty good, considering the talent in front of the camera and the botched story. Sterling Hayden shows some life as a French privateer and, considering the by-the-numbers acting -- which seems to concentrate more on the clarity of the words than the subtlety of the emotions -- even Rhonda Fleming as another pirate captain with whom he is in love, is pretty good.
The best part of the movie, however, is provided by William Skall's cinematography. A Technicolor specialist, he keeps the camera moving in a lively fashion throughout and seems to have settled on 17th Century Dutch painting, with frequent Rembrandt-like dark backgrounds and muted tones for a lot of shots. This was something you could do with Technicolor, playing around with the chroma of the prints, that was lost when Technicolor fell out of fashion, that has only recently been restored to modern movies by computer techniques.
There isn't much that will surprise anyone familiar with pirate movies, but the overall effect is worthwhile.