I'm writing a research paper, and one of my sources keeps referring to the Nine Years War as the Ten Years War. Is there a valid reason, or is the author just bad at math?
What are the sources? We're talking about the war of the Grand Alliance from 1688 to 1697, right? Because the opening moves of the war occurred in 1687, so I can see the author dating the war from that point, especially if he were German.