Both incidents however , are fictional ; Hua was killed Killing in a battle Hostile_encounter against Sun Jian .

In the fictional `` Star Trek '' universe , the Dominion War is a conflict Hostile_encounter between the forces of the Dominion , Cardassian Union and , later , the Breen Confederacy against the Alpha Quadrant alliance of the United Federation of Planets , the Klingon Empire and , later , the Romulan Star Empire .

The primary setting Placing of much of the series is aboard the fictional Starfleet-controlled space station Deep Space Nine , located adjacent to the mouth of a stable Placing wormhole near the planet Bajor .