The Chesapeake Bay played a starring role in the conflict that produced our national anthem. Francis Scott Key wrote The Star Spangled Banner as the city of Baltimore was under attack by a vast enemy fleet and army that had just destroyed the new capital, Washington City.     1812 was a long time ago. High tech was represented by small, wooden sailing vessels, powered by wind and sweat, technology little changed in hundreds of years. You want to talk to Europe? Could take months...