The Smurf Village Defense System is a system used by the Smurfs to protect themselves whenever a threat makes its way into the Smurf Village. It mostly appears in the 2011 Smurfs movie in the form of two logs which were activated by Papa Smurf when Gargamel and Azrael breached the invisibility field protecting the Smurf Village.
Hero: The Guardian Smurf stories
The defense system appears in the HERO: The Guardian Smurf story series in the form of two logs: one bigger and one smaller and was created by Handy Smurf. The system was later upgraded to use Hero's Ki energy as a stronger form of protection against all forms of threats.