This is not really a drama;this is not a story of sound and fury either. Sirk's swashbuckler is a bit tongue-in -cheek .He often makes a fool of his hero (Rock Hudson ,his favourite actor ,he will be featured in many other Sirk works including the stunning "magnificent obsession" and "written on the wind" ): he tries to help captain Thunderbolt to escape and ends up himself in prison;on the roof he unintentionally rings the bell.Barbara Rush (another Sirk's favourite:she will team up with Hudson again in " Taza" and "obsession")gets a good whacking.The political side remains vague and neither the Irish nor the English seem to take it seriously although it's not really a comedy.But the main interest is the splendid cinematography ,the marvelous landscapes :the scene when Lightfoot and Regis try to escape and end up in the river is masterfully filmed.There's something nonchalant ,which makes "captain Lightfoot" a distant cousin of "a scandal in Paris" (1946) in Sirk's filmography.
That said,it's entertaining but I do not think that it ranks with the director's best films.