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Operation Tyr was a battle of the ISC War of Pacification. The Grand Alliance attacked the capital system of the Interstellar Concordium. (Star Fleet Battles)
It marked the only major engagement of the Klingon Defense Force during the conflict. Admiral Kerla was killed in action and his flagship, the IKS DighreS, a PumwI'-class dreadnought, was destroyed. (Star Trek: False Vacuum: "Structural Unemployment")