http://www.cbc.ca/beta/news/technology/ ... -1.4259123

Interesting read had no idea that they had a working sub that long ago

   

Never mind 1864 and the US Civil war, you have to go back to 1776 and the Revolutionary War for the first attack by an American submersible craft, the Turtle, which attacked a British Man of War in New York Harbor.

1776 World’s first submarine attack

   

You win yours was a way more interesting read.