Since it is now Civil War times, I changed Privateers (USA only up to 1812), to Commerce Raider. Both CSA and USA have raiders. I know, its Union propaganda that called their raiders - Commerce Raider Hunters, but when you think about it, they are all raiders.
So, Raiders try to find and destroy Merchants and enemy Raiders. But in my scenarios there are no CSA Merchants. Just USA Merchants. So USA Raiders are trying to find and destroy CSA Raiders.