The Sixteenth Fleet was a numbered Federation fleet active in the late 24th century It was one of many Federation and allied fleets that were involved in the Dominion War. On stardate 51474.3 the Dominion launched an attack against Coridan, which was defended by the Sixteenth along with the Sixth Fleet. The two fleets managed to drive the Jem'Hadar away, but not before significant damage was done, which crippled dilithium production on the planet for months. (LUG RPG: The Dominion War Sourcebook: The Fires of Armageddon)