The Federation-Klingon War was a brief but intense conflict fought primarily between the United Federation of Planets and the Klingon Empire, from late 2372 to mid-2373. Intermittent hostilities, and later open war, between the two powers followed from the breakdown of the Federation-Klingon Alliance in the wake of the Klingon-Cardassian War, which were engineered by Changeling agents to weaken the Alpha Quadrant. A fragile cease fire was signed after the involvement of the Dominion was exposed, but the resumption of the alliance did not occur until the Dominion made a full-scale incursion through the Bajoran wormhole.