Fusion torpedo

A fusion torpedo was a standard weapon aboard Klingon warships in the mid-23rd century. The torpedo's destructive energy was based on nuclear fusion, and was soon replaced by the photon torpedo. (TOS short story: "Though Hell Should Bar the Way").


 * Note: The use of fusion torpedoes, a weapon less advanced than a photon torpedo, in the 23rd century, would seem to contradict with Klingons using photon torpedoes in the mid-22nd century.