On August 5, 642 AD, Penda of Mercia and Oswald of Bernicia met for the Battle of Maserfield. To this day, nobody knows what the problem was, why they both felt Thrashings were needed, or where exactly everybody fought. Oswald was killed. Nothing specific happened as a result.
And from this story We Rhinos learn what? We are just glad We were not there at the time.