As far as I know, there have been at least five “Battles of Kosovo” fought over the years, and that’s not including the Kosovo Operation in World War II and the 1998-1999 Kosovo War. Of those five battles, the Ottomans were major belligerents in three and contributed troops to a fourth. So when you’re talking about “the Battle of Kosovo” it’s important to be specific.
Source: Today in European history: the Second Battle of Kosovo (1448) ends