Battle Against Ulfric

the Battle between King Gronar Iron-Hand and ulfric stormcloak was the climactic Fight between the King of the Empire and the roug jarl of windhelm at th end of the civil war

King Gronar Iron-Hand

 * Kill Ulfric and End The Stormcloaks

General Tullius

 * Kill Ulfric and End The Stormcloaks

Ulfric

 * Kill King Gronar Iron-Hand
 * Protect his Rule over Eastmarch

Battle Against Ulfric Stormcloak
General Tullius and Legate Rikke Led by they're King, broke into the Palace of the Kings, where they found themselves face to face with Ulfric stormcloak and Galmar stone-fist. They started to fight against them, and while Tullius and Rikke Dealt with Galmar King Gronar Iron-Hand charged towards the rebel leader fighting ulfric 1 v 1 and eventually Killed him, ending the threat of the stormcloaks once and for all

Aftermath
after slaying ulfric King Gronar Iron-Hand would hunt down the Remnants of the Stormcloaks Across Tamriel, eventually wiping them out, Ending they're threat against tamriel forever