The Battle of Klach D'kel Brakt was a decisive battle fought between the Klingon and Romulan Empires in 2271 at the gaseous cloud Klach D'kel Brakt, or "Briar Patch". The Klingon forces, led by Kor, achieved a memorable victory. The battle included hand-to-hand combat using melee weapons.
Nearly a century later, Kor re-enacted the battle on Deep Space 9's holosuites. Quark complained to Odo that Kor only paid for one hour, but had been in there for three "fighting the Battle of Klachdachbrach or some such thing over and over." Odo removed Kor, who was quite drunk with Breshtanti ale, and had him sent to a holding cell to sleep it off. (DS9: "Blood Oath")