The following is a list of unnamed Klingon and Romulan starships of the D7 class.
By commander
By year
Confrontation near Capella IV
This unnamed vessel is a small class of Klingon scout/warship utilized by the Klingon Empire during the 23rd century.
In 2267 a ship of this class transported Kras to Capella IV, so that the Klingon agent could acquire the rare mineral found there call topaline.
The ship later lured the USS Enterprise away from the Capellan homeworld in an attempt to bolster Kras' position during negotiations, by first relaying false distress calls from the SS Deirdre and USS Carolina. When the Enterprise returned to Capella IV, the warship attempted a brief stand-off, but ultimately yielded. (TOS: "Friday's Child")
Background
The exact classification of this vessel was originally somewhat obscure. Kras identified his ship as "a small scout ship," nevertheless, the ship encountered by the Enterprise, which may or may not have been the same vessel, was recognized by Pavel Chekov as a "Klingon warship," and was referred to in the false distress calls sent by the Klingons as a "Klingon vessel." Visually, it appeared as a flat shape with some sort of "handle" affixed to it.
These inconsistencies were seemingly remedied in the 2007 remastered release of this episode, which visually established this ship as a D7 class warship.
Pursuit in the Tellun system
In 2268 this Klingon battle cruiser, working in conjunction with Kryton, attempted to destroy the USS Enterprise while it travelled through the Tellun system.
After Kryton sabotaged the warp drive of the Enterprise, it was the job of the battle cruiser to strafe the Federation starship in order to persuade it into engaging its warp drive and destroying the ship.
The ship was ultimately outmaneuvered by the Enterprise and limped back to Klingon territory. (TOS: "Elaan of Troyius")
Capture of the Enterprise
Later in 2268, three Romulan battle cruisers surrounded and captured the USS Enterprise after it crossed Romulan Neutral Zone.
They would eventually be outmaneuvered by the Enterprise after it engaged a cloaking device stolen from the Romulan flagship.
(TOS: "The Enterprise Incident")
Encounter en route to Rator III
In 2269, two unnamed Romulan battle cruisers intercepted the USS Enterprise as it violated the Neutral Zone, while the Federation ship was en route to Rator III.
During a brief engagement the Enterprise disabled the propulsion systems of the lead cruiser, and the power supply of the second cruiser. Following the engagement the Romulan cruisers to moved off, the latter, according to Spock needed several days to complete repairs. (TAS: "The Survivor")
Mousetrap in the Delta Triangle
Later in 2269, the ships, including the IKS Klothos, were involved in a mouse trap maneuver against the USS Enterprise in the Delta Triangle.
The commander of the lead sister ship was Commander Kuri, who contacted the Enterprise after witnessing what he believed to be the destruction of the Klothos, demanding their surrender.
After refusing to surrender, the two sister ships fired on the Enterprise, only to lose it from their sensors after it entered the region of space known as Elysia. (TAS: "The Time Trap")
Ambush of the Enterprise
In 2270, three Romulan warships ambushed the Enterprise from behind a type 4 asteroid, just outside the Romulan Neutral Zone.
They would later pursue the Federation vessel deep into Federation space before retreating after failing to capture the ship. (TAS: "The Practical Joker") Template:D7ClassStarships