This is a map, with a difference, because like all things, it was adapted to show a landscape quite unknown. The black serpent is not the River Meuse, as you might think from its shape, it is the battle line. The Meuse is shown, if you look closely, as a white line, with black edges, snaking up the left hand side. Coming in to the frame at the top is a black dotted line and that marks the frontier. The straight lines with the cross lines all along them are indeed railways, the same symbol being used as on a standard map. One of the most famous railways was called The Meusien, and it was a narrow gauge railway that ran on a single track, right beside the roadway which is marked as a thin dotted line. It was called many things, but The Little Meusien was christened it by none other than General Petain, and seemed to stick once war had gone. It brought, and took away, many things - passengers - the young and hopeful towards the front, and the injured or dead away - horses - ammunition - and most importantly it brought food, which is how they were able to resist there for so long.
Verdun, or Verdun Sur Meuse (Verdun on the Meuse) was a huge battle, fought over three hundred days from the 21st of February until the 16th of December 1916. However fighting still took place in that area for the rest of the war.
Our World Tobacco Issues Indexes describe this set as
WAR MAP OF THE WESTERN FRONT INCLUDING THE RHINE AND SWISS FRONTIER - SERIES NO.2" Sm. Brown. Nd. (54)
A) Back "Smoke Exmoor Hunt Mixture and Cigarettes"
B) Back "Smoke New York Mixture"
There is a slight error in the original book because the word "FRONTIER" is shown in the plural, "FRONTIERS". It has been corrected in the second.
I have not been able to find out what New York Mixture was, or see any packaging. But I now realise this is not a great term to search for, and that there are very many tobacco shops in New York... However Exmoor Hunt Mixture (and presumably the cigarettes) was a name that came through the bloodlines of W.O.Bigg, and the leaping stag was there at that time too. The mixture was a broad cut and seems to have been Virginia most of all, blended with a quantity of Latakia.