Boarding, in its simplest sense, refers to the insertion on to a ship's deck of individuals. However, when it is classified as an attack, in most contexts, it refers to the forcible insertion of personnel that are not members of the crew by another party without the consent of the captain or crew. Boarding may be carried out during wartime by naval infantry in an attempt to seize and possibly destroy the vessel, or it may occur in peacetime by pirates and other criminals, or as a means of inspection by a nation's coast guard (or navy) to prevent piracy and smuggling.