In accord with this announcement, Private Ellis talked nothing but German for a week with an orderly of German parentage who had enlisted with the Canadian army to help "get the kaiser." By the end of that time he felt as if he could hold his own, conversationally, at anything from a kaffee klatsch to a Berliner royal turnverein, and announced that he was ready to make his "high dive" into the land of the enemy.

CHAPTER XX

"SECOND LOOIE ELLIS"

Meanwhile activities at the front had been progressing in a decisive manner, although familiarity with the progress and its significance was restricted to an exclusive class, consisting of certain officers and an army of industrious workers, who might be classed as the moles of modern warfare.

The latter were the engineers and workmen whose occupation at times was a good deal like that of a miner. It had been their duty to tunnel, tunnel, tunnel, until you'd think the whole of the country in this vicinity must be a system of underground passages that would almost rival the catacombs of Rome.

This tunneling, or sapping, was one of the most important forms of strategy in the war. Undoubtedly in future years, remnants of many of these underground passages, preserved for their value as historical curiosities, will be inspected by thousands of tourists visiting the scenes of the world's greatest conflict.

Vimy Ridge, near the end of the historic fight at that long elevation of earth, was a veritable human anthill. The work of opposing armies in their efforts to undermine each other is an exceedingly interesting, if terrible, operation, and Vimy Ridge furnished an excellent illustration of this.

Early in the fight for possession of the hill the tunneling began. At the beginning of this narrative, when Private Irving Ellis and "Second Looie Tourtelle" were scouting in No Man's Land, this boring of the elongated mole on the earth's surface was as much of a fencing contest as a sword battle between two seventeenth century Frenchmen. The Germans held the hill, had taken possession of it and intrenched themselves on the eastern slope as one of the strongholds of their advanced positions in France. The Canadians and the British in attempting to dislodge the invaders, found themselves at a considerable disadvantage. There seemed to be only one way to overcome this difficulty without a great slaughtering of the forces of the Allies. This was by boring under the hill, mining it with trinitrotoluol, touching off the explosive with electric sparks and blowing the fortified mound into Kingdom Come.

Who first started the undermining process may never be known, unless both kept records of dates and doings along this line. It is probable, however, that it was begun by the Canadians, for the opposing army had not as great incentive for haste as had the Allies. Moreover, they did not have to go back so far to start their tunnels, and their subterranean operations were more of defensive than offensive character.

Statements from authoritative sources since the close of the war indicate that this tunneling contest was somewhat of a "diving" nature. It was a contest of depth as well as progress. The Allied engineers began operations at a certain level and went forward. As they advanced they listened. It was like an American Indian putting his ear to the ground to listen for the approach of distant enemy horsemen, or a physician examining the chest of a patient with a stethoscope for "unfriendly" sounds in the heart and lungs. The engineers carried a sort of subterranean stethoscope to detect the approach of enemy tunnelers. The instant they heard sounds of Prussian engineers boring their way to meet the sappers of the Allies, they stopped operations and went back to a new starting point and began over again, this time on a lower level. This process was repeated many times, the Prussians ever planning to get near enough to the Canadian sappers to enable them to stop their subterranean operations with high explosives, and the Allied tunnelers purposing to plant enough trinitrotoluol under Vimy Ridge to blow it sky-high.