(written from a Production point of view)
The Dameron system was a star system in the Cardassian Union, where a weapons depot was located. In 2371, the USS Defiant attacked the depot after it was stolen by Maquis operatives. It was one of several attacks designed by Tom Riker to draw Cardassian forces away from the Orias system.
This system was mentioned in the script of DS9: "Defiant"; however, the line was cut from the final episode. (Star Trek: Deep Space Nine Companion - A Series Guide and Script Library, )