Klingon Interceptor near Organia

In 2267, an unnamed Klingon warship was a warship sent to Organia by the Klingon Empire as a prelude to invasion of that planet. On stardate 3198, the vessel intercepted and attacked the USS Enterprise upon entering the Organian's star system. 
After being hit by an unprovoked bombardment of magnetic pulses, the Enterprise returned phaser blasts, completely destroying the Klingon vessel.