Encounter at Lea

The Encounter at Lea took place in May of 2252. While on a routine patrol of the Lea system, the Federation cruiser USS Constitution, as well as the destroyers Demetrius and Buena Vista, came under a surprise attack from the 127th Cruiser Squadron of the Klingon Empire. The Klingons, emerging for thier hidding space in the tail of a large comet, destroyed the Demetrius and heavily damaged the Constitution before leaving the scene in a search for more targets (Star Trek: The Four Years War).