Unless we have an article for some other "Battle of the Strait of Otranto" (like Battle of the Strait of Otranto (1917)), there is no justification for disambiguating this name.  If both are notable, then the other should have an article, and there needs to be a hat note from the one that has primary usage to the other, or Battle of the Strait of Otranto needs to be a dab page.  See also WP:D and WP:PRECISION.  Since this is the one and only ""Battle of the Strait of Otranto" currently covered in Wikipedia, I'm going to revert this move.