A Cardassian star system where Captain Benjamin Maxwell of the USS Phoenix destroyed what the Cardassians described as an unarmed science station in 2367, endangering the year-old peace.
The Cuellar system is where the crisis of the Next Generation episode The Wounded begins. A Cardassian warship fires on the Enterprise, and Gul Macet explains that he is retaliating for an unprovoked Starfleet attack on a research station in the system two days earlier.
Starfleet confirms that the Phoenix was responsible and orders Picard, with Macet and his aides aboard as observers, to find Maxwell before the treaty collapses. Maxwell goes on to destroy a warship and a supply vessel while the Enterprise can only watch on long-range sensors.
Maxwell insists the Cuellar station was a military post and part of a secret Cardassian build-up. Picard removes him from command, yet warns Macet that he suspects the claim was true.