it is interesting to me that the one nation that truly had a hard-hulled large frigate was the US, not the French. Artistic license. We were visiting St Augustine and the park service fired a real cannon that guarded the port. Impressive.
Wow! That's a pretty big historical inaccuracy for Hollywood to make. I don't know much about navies of that time period, least of all, who was fighting who at what time in history. Was the US involved in the fracas between England and France during that time period? If not, it's probably not an important error, unless the movie made and actual claim that France had the largest frigate on the ocean.
The one part of that movie that I have questioned was the Captain's strategy of luring in the French ship. It's hard to believe he developed a new strategy from a bug. I would think that strategy must have been used before. But then every military trick had a first time, so maybe he was the one. I would have enjoyed a sequel, and I thought the ending left that open, but really the story was told by then, and a sequel would have been little more than an afterthought.
I think I heard that in WWII the allies would lure German submarines in the same way. The German subs would surface at close range to use their cannons, thereby saving torpedoes for bigger prizes, but the Allies would sink the subs before anyone came out of the hatch to man the cannon. That probably only worked for a week or two, before the Germans stopped doing that.