Sarah Palin yesterday insisted her claim at the Old North Church last week that Paul Revere “warned the British” during his famed 1775 ride — remarks that Democrats and the media roundly ridiculed — is actually historically accurate. And local historians are backing her up. Palin prompted howls of partisan derision when she said on Boston’s Freedom Trail that Revere “warned the British that they weren’t going to be taking away our arms by ringing those bells and making sure as he’s riding his horse through town to send those warning shots and bells that we were going to be...