ISS Defiant (NX-74205)

In the mirror universe, the Defiant was used by the Terran Rebellion to fight the Alliance.

In 2371, during a visit to "our" universe Miles "Smiley" O'Brien was able to download the Defiant class schematics from Deep Space 9's computers. He brought them back to the mirror universe, where construction began at Terok Nor.

The Rebellion had difficulty in operating the starship, so Jennifer Sisko lured Benjamin and Jake Sisko to their universe, where Captain Sisko was able to iron out the problems and use the starship to prevent Regent Worf from retaking Terok Nor for the Alliance. (DS9: "Shattered Mirror")

The Defiant was also used to pursue Ezri Tigan and Brunt and to repel another attack by the Alliance in 2375. (DS9: "The Emperor's New Cloak")