'Marching regiment' definitions:

Definition of 'Marching regiment'

From: GCIDE

Marching \March"ing\, a. & n., fr. March, v. [1913 Webster]
Marching money (Mil.), the additional pay of officer or soldier when his regiment is marching.
In marching order (Mil.), equipped for a march.
Marching regiment. (Mil.) (a) A regiment in active service. (b) In England, a regiment liable to be ordered into other quarters, at home or abroad; a regiment of the line. [1913 Webster]