In 2154, two Xindi-Reptilian warships escorted Degra's ship during initial testing of the Xindi test weapon in the Calindra system. (ENT: "Proving Ground") In 2367, a radical faction based on the Beta moon of Peliar Zel sent a ship claiming to be an escort vessel to intercept the Federation shuttlecraft Hawking. (TNG: "The Host" ) The Defiant-class Federation starship, originally developed to counter the Borg, was officially classified as an escort vessel, but was unofficially a warship. (DS9: "The Search, Part I")