Penetrate-Defenses
  superclass: Tactical-Mission-Task 
  superclass: Penetrate 
  agent: Military-Unit <----> Actor 
  object:  Tangible-Entity plays Barrier <---->  Acted on 
  site: a Region <----> Location 
 
FM 3-90: a form of maneuver in which an attacking force seeks to rupture enemy defenses on a narrow front to disrupt the defensive system 

