ISS Defiant The ISS " Defiant " ( NX - 74205 ) was a warship that was in service to the Terran Resistance Forces in the latter half of the 24th century . The " Defiant " was constructed and launched in 2372 by the Rebellion at , in orbit of the planet . The design of the " Defiant " was based on specifications of its counterpart the which were " acquired " from Deep Space 9 in 2371 . This warship proved of crucial importance in fighting the Klingon - Cardassian Alliance at the Battle of Terok Nor , and represented an important boost to the Terran ' s fighting power during the Terran Rebellion . History . In 2372 , shortly after the rebels captured Terok Nor , the Alliance launched a major assault fleet to take back the station , a fleet personally commanded by Regent . Recognizing the danger in light of the fact that they had only a handful of raiders remaining , and the other rebels began constructing the " Defiant " . Construction proceeded relatively smoothly and rapidly until the final testing phase . Much like her counterpart had in testing , the ship nearly shook itself apart when the warp core was used at full power . Desperate for help , O ' Brien recruited Captain Benjamin Sisko , who had overseen the construction of the original " Defiant " several years earlier in his universe . Sisko recommended a complete overhaul of the ship ' s inertial damper s to enhance structural integrity , and because the repairs were rushed due to the incoming Alliance fleet , they were completed before the battle began . Although the small ISS " Defiant " was heavily outgunned by the Regent ' s flagship , the rebel ship inflicted major damage on the massive warship while avoiding most return fire due to the command and later piloting of Captain Sisko . Under the " Defiant " s heavy assault , the Regent was forced to abandon his goal of retaking Terok Nor and retreated from the battlefield . ( ) In 2375 , brought both Quark and Rom from their universe with a Klingon cloaking device , which they were to install in the Regent ' s flagship as ransom for Grand Nagus Zek . The " Defiant " , under the command of " Smiley " , came after them , hoping to reach the ship before the cloaking device was fully installed . Rom , however , manage to install the device , and the battle cruiser was able to track the " Defiant " undetected . After testing the cloak against the " Defiant " s sensors , the Regent ordered the ship to decloak and attack . During the battle that followed , the Regent ' s ship was disabled , due to sabotage Rom had inflicted during the installation of the cloaking device , and the " Defiant " was able to force a surrender and take the Regent prisoner . ( ) Design . Physical arrangement . Aside from the lack of a cloaking device and different internal furnishing , the ISS " Defiant " was virtually identical to her prime universe counterpart , proving herself one of the most powerful warships in the sector . The ship had four decks and was of a compact design . The bridge , located on deck one , incorporated the tactical , science , and operations console s on each side with one central helm console in front of the commander ' s chair . Armaments . The ship was equipped with four phaser cannon s , two on both the port and starboard sides , at least one aft phaser emitter , and a complement of quantum torpedo es , the latter a previously unknown technology . Together with powerful deflector shield s , the " Defiant " was able to hold its own against several smaller Klingon Birds - of - Prey and inflict heavy damage on the larger and " Negh ' Var " - class battle cruisers despite never being battle - tested . ( )