The assault by the ageing Klingon warriors Kor, Koloth and Kang, with Jadzia Dax, on the stronghold of the Albino on Secarus IV, fulfilling a blood oath sworn eighty years earlier.
In the Deep Space Nine episode Blood Oath, three Klingons familiar from the Original Series gather on the station. Decades before, they defeated a band of raiders whose leader, the Albino, took revenge by infecting each man's firstborn son with a fatal virus. Curzon Dax, godfather to Kang's son, swore with them to hunt him down.
Kang has finally found the Albino's hideaway on Secarus IV. Jadzia Dax insists the oath binds her too, over the objections of Sisko and Kira and against Kang's own wishes. She then learns that Kang has made a bargain with the Albino for a hopeless but glorious last fight.
Dax proposes a way to disable the guards' energy weapons from orbit so the attack can succeed with blades alone. They storm the compound. Koloth is killed and Kang mortally wounded; Dax holds the Albino at sword point but hesitates, and the dying Kang strikes the final blow. Kor survives.