U.S.S. Sri Lanka
The U.S.S. Sri Lanka was a Federation starship in service to Starfleet in 2409. In that year, she fought alongside the U.S.S. Byzantium and U.S.S. Pollux against the Crystalline Entity, which was attacking a Federation colony in the Teneebia Sector.
The Sri Lanka sustained heavy damage and casualties from the Entity's Matter Conversion Beam, before finally being destroyed by a squadron of Tholian Mesh Weavers that had arrived to protect the Entity. The Byzantium was the only Federation starship to escape.