incursion

incursion
    n 1: the act of entering some territory or domain (often in
         large numbers); "the incursion of television into the
         American living room"
    2: an attack that penetrates into enemy territory [syn:
       {penetration}, {incursion}]
    3: the mistake of incurring liability or blame
    

Incursion \In*cur"sion\, n. [L. incursio: cf. F. incursion. See
   {Incur}.]
   [1913 Webster]
   1. A running into; hence, an entering into a territory with
      hostile intention; a temporary invasion; a predatory or
      harassing inroad; a raid.
      [1913 Webster]

            The Scythian, whose incursions wild
            Have wasted Sogdiana.                 --Milton.
      [1913 Webster]

            The incursions of the Goths disordered the affairs
            of the Roman Empire.                  --Arbuthnot.
      [1913 Webster]

   2. Attack; occurrence. [Obs.]
      [1913 Webster]

            Sins of daily incursion.              --South.

   Syn: Invasion; inroad; raid; foray; sally; attack; onset;
        irruption. See {Invasion}.
        [1913 Webster]
    

41 Moby Thesaurus words for "incursion":
      air attack, air raid, air strike, boarding, encroachment, entrance,
      entrenchment, escalade, fire raid, foray, impingement, imposition,
      infiltration, influx, infraction, infringement, injection, inroad,
      insinuation, interference, interjection, interloping,
      interposition, interposure, interruption, intervention, intrusion,
      invasion, irruption, obtrusion, overstepping, raid, razzia,
      saturation raid, scaling, shuttle raid, transgression, trespass,
      trespassing, unlawful entry, usurpation