A device to stop operating enemy vehicles, vessels and aircrafts: A container as part of an adequate transport mean contains such substances which when getting in contact develop rigid plastics foam with a delayed hardening time. The plastics foam expelled via spray nozzles hardens quickly at elevated temperatures and blocks movable parts of traversing enemy vehicles e.g. tracks of tanks and seals the air-supply of combustion engines and hinders the use of optical devices. If a conducting plastics foam is used outer parts of electronic devices e.g. antennas are disabled.A large cloud of small droplets consisting of still soft plastics foam is generated in the flight-path of an aircraft whereby the droplets are sucked into the engine where the hardening process is rapidly accelerated by the high temperature therein so that the engine is blocked by the hardened rigid plastics foam.