- The Klingon-Cardassian War begins after the Klingon Defence Force invades Cardassian territory. (DS9: "The Way of the Warrior")
- The Klingons attack Deep Space 9 to capture the Cardassian Detapa Council who sought refuge on the station. The Klingons eventually opt to retreat after Starfleet reinforcements come to the station's aid. (DS9: "The Way of the Warrior")
- Rex Callan joins Brendan Patol's Maquis cell. (Star Trek: The Farthest Star: "Initiation")
- The Federation-Klingon War of 2372-73 begins when the Klingon Empire attacks the Archanis sector. (DS9: "Broken Link")
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