Re: '300 years ago' , in this film's context, was the 1950s!
^ The person, yes. The country, no. Just because Archer's granddaddy was from the US (assuming he actually was, which is not certain by any means), doesn't have anything to do with where the actual fighting was.
"Pitching is simple -- cheese for the kitchen and a yakker for the kudo." - Dennis Eckersley