Unnamed Defiant class starships
List of unnamed Federation starships of the .

Second Fleet 

In late 2373, at least two of these starships belonged to the Second Fleet. 

While the Dominion attacked Deep Space 9, during the second Battle of Deep Space 9, several of these vessels crossed the Cardassian border and destroyed the Dominion shipyards on Torros III. These ships later joined with the  and , following the evacuation of DS9, for a counterattack against the Dominion forces. ()

Recapture of the USS Prometheus  
In 2374, these two starships escorted an  starship into battle with the , the T'Met and two other Romulan  warbirds. 

During the battle one of the ships was damaged by a misguided photon torpedo that was fired from the Prometheus. ()

Escort for USS Voyager  

In mid-2378, these two starships stationed near the Sol system were dispatched by Admiral Owen Paris to a defensive point near an opening Borg transwarp aperture near Earth. 

The ships opened fire on the emerging Borg sphere and assisted in its destruction. Following the emergence of the  from the debris, the unnamed Defiant-class starships assisted in escorting Voyager back to Earth. ()

bg:Безименни кораби от клас Дефайънт
de:Weitere Raumschiffe der Defiant-Klasse
fr:Vaisseaux inconnus de classe Defiant
Defiant class