The USS Foch was a Defiant class escort that served in the Sixth Fleet during the Dominion War, serving primarily as a security escort for the USS Valdemar.
Captain Elan Fairchild commanded the vessel during the war.
AfterOperation Return engineers from the Foch aided in repairs to the USS Lionheart. ("Familiar Faces")
After the war, it remained in Cardassian space as part of the Starfleet Occupation Force.