The tachyon detection was first seen in practical use during the Starfleet blockade of the Klingon-Romulan border during the Klingon Civil War. Twenty-three starships successfully prevented a convoy of Romulan supply ships from sending further aid to the forces loyal to the House of Duras, tilting the balance in favor of Gowron, the legally-appointed leader of the Klingon High Council. During this operation, Sub-Commander Sela attempted to disrupt the grid by bombarding the USS Sutherland with tachyons, creating a blind spot. Temporarily in command of the Sutherland, Lieutenant Commander Data recognized her tactic and used the residual tachyons to detect the ships trying to pass through. (TNG: "Redemption II" )