The Battle of Klach D'Kel Brakt was a battle between the Klingon Empire and the Romulan Star Empire in 2271. Among the Klingons who helped to win the battle at Klach D'Kel Brakt was Kor, commanding the IKS Korvat.
In 2370, Kor spent three hours recreating the Battle of Klach D'Kel Brakt in one of Quark's holosuites on Deep Space 9, as he was determined to win. Odo described the Battle of Klach D'Kel Brakt to Quark as being legendary. (DS9 episode: "Blood Oath")