A planet inside Cardassian territory, site of a starbase and orbital dock, which is among the targets of Martok's cavalry raid behind Dominion lines in Once More Unto the Breach.
In Once More Unto the Breach, set in 2375, General Martok leads a squadron of five birds-of-prey on a fast raid across the Cardassian border, intended to cause confusion and draw Dominion forces away from the front. The base at Trelka V, guarded by Galor-class cruisers, is the most important target.
Aboard Martok's flagship is the aged Dahar master Kor, given a junior post at Worf's urging. When Martok and Worf are injured during the attack on Trelka V, Kor takes command, but his mind drifts back to a battle fought decades earlier and his confused orders nearly destroy the ship.
The raid succeeds, but Jem'Hadar ships give chase as the squadron withdraws. Kor redeems himself by taking a single bird-of-prey back to delay the pursuers, dying in an action that lets the others escape.