BortaS bir class
The BortaS bir class was a type of warship used by the Klingon Empire during the mid-23rd century.

Several vessels of this class fought in the  of 2256-57, starting with the Battle of the Binary Stars in 2256. ()

In November of that year, General  took a BortaS bir-class ship to claim the disabled Sarcophagus. ()

As the war dragged into 2257, two BortaS bir-class vessels were part of the armada that gathered to attack Earth, however they disengaged when they received word that the war was over. ()

Klingon starship classes