'Galloper gun' definitions:

Definition of 'Galloper gun'

From: GCIDE

Galloper \Gal"lop*er\, n.
1. One who, or that which, gallops. [1913 Webster]
2. (Mil.) A carriage on which very small guns were formerly mounted, the gun resting on the shafts, without a limber. --Farrow. [1913 Webster]
Galloper gun, a light gun, supported on a galloper, -- formerly attached to British infantry regiments. [1913 Webster]