The Klingon-Cardassian War was a conflict between the Klingon Empire and the Cardassian Union that took place from 2372 to 2373. The war was precipitated by the Klingon belief that the Cardassian Union had been infiltrated by changelings, but in fact it was the Empire that had been infiltrated, as General Martok had been replaced by a changeling. The war resulted in the devastation of the Cardassian Union, which paved the way for the Dominion to take control of the Union later in 2373. (DS9: "The Way of the Warrior", "By Inferno's Light")
Fan continuities Edit
Despite the fact that his parents were refugees from the Cardassian Union who had made their home in the Federation, the outbreak of the war was one of the factors that motivated Golin Dalar to apply for admission to Starfleet Academy, to which he was admitted shortly before the war ended.