Source : Webster's Revised Unabridged Dictionary (1913)

Troop \Troop\, v. t.

   {To troop the} {colors or colours} (Mil.), in the British
      army, to perform a ceremony consisting essentially in
      carrying the colors, accompained by the band and escort,
      slowly before the troops drawn up in single file and
      usually in a hollow square, as in London on the
      sovereign's birthday. Trooper \Troop"er\, n.
   A mounted policeman. [Australia]

   Note: The {black troopers} of Queensland are a regiment of
         aboriginal police, employed chiefly for dispersing wild
         aborigines who encroach on sheep runs.