troop \troop\, v. i. imp.  p. p. trooped; p. pr.  vb. n.
   trooping.
   1. to move in numbers; to come or gather in crowds or troops.
      "armies . . . troop to their standard." --milton.
      1913 webster

   2. to march on; to go forward in haste.
      1913 webster

            nor do i, as an enemy to peace,
            troop in the throngs of military men. --shak.
      1913 webster
see also:
trooped trooping