*PLEASE READ BEFORE COMMENTING*
There aren't too many videos of this game. This is, as the title says, Sid Meier's Pirates, an action-adventure sandbox whatever game, remake of the original Pirates from 1887 and Pirates Gold from 1993.
In this gameplay video, I attack the main villain Marquis Montalban's hideout.
There are two parts to this fight. First, is a land battle against mercenary indians. (scouts and archers) The AI seen in this fight could be considered an offense to natives. Just watch how stupid moves it makes. The AI in other land battles isn't too great either... but yeah.
The second part is a swordfight against the Marquis himself. This is the hardest swordfight in the game. Marquis Montalban will always wield a rapier, and has both lightning-quick offense and defense. So, on the highest difficulty, Swashbuckler, you really need to be quick.
For this fight, I pick the cutlass, since most of the time you'll need to be just dodging and parrying attacks. Taunting doesn't really help much in this fight. As you can see, my strategy was mainly to wait until he does a high chop, quickly duck and then thrust. Obviously I don't keep to it all the time, hence the mistakes. I had all of the items that would help me in the fight (metal cuirass, silk fencing shirt, set of perfectly balanced swords) but I didn't pick the skill of fencing this time. (I took medicine, that's more useful later in the game)
Sorry for the rather poor quality, that's all, enjoy.