The Collaborative International Dictionary of English v.0.48:

Marcher \March"er\, n.
   One who marches.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Marcher \March"er\, n. [See 2d March.]
   The lord or officer who defended the marches or borders of a
   territory.
   [1913 Webster] Marchet

WordNet (r) 3.0 (2006):

marcher
    n 1: an inhabitant of a border district
    2: walks with regular or stately step [syn: marcher,
       parader]
    3: fights on foot with small arms [syn: infantryman,
       marcher, foot soldier, footslogger]

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "marcher":
   ambulator, backpacker, foot passenger, foot soldier, foot traveler,
   footslogger, hiker, hitchhiker, hoofer, infantryman, jaywalker,
   paddlefoot, pedestrian, peripatetic, trailsman, tramper, walker,
   walkist