Abstract: A system for defending against an intruder includes a building having a wall dividing first and second spaces and a nonlethal device selectively operable through the wall. The nonlethal device includes an enclosure mounted to the wall and having an access door for selectively accessing an interior compartment of the enclosure from the first space, a container of a nonlethal chemical weapon, such as a lachrymatory agent, having an outlet and located within the enclosure, a conduit extending from the container to the second space through the wall and having an inlet in fluid flow communication with the outlet of the container of nonlethal chemical weapon, and a valve operable to selectively release the nonlethal chemical weapon from the container and through the conduit to the second space to form a cloud of the nonlethal chemical weapon within the second space.