Source : Webster's Revised Unabridged Dictionary (1913)

Breach \Breach\, v. t. [imp. & p. p. {Breached}; p. pr. & vb. n.
   {Breaching}.]
   To make a breach or opening in; as, to breach the walls of a
   city.

Source : WordNet®

breached
     adj : forcibly broken through or opened up; "the enemy poured
           through the breached line of defense"