ALONG the old Roman road that crosses the rolling hills from the upper waters of the Marne to the Meuse, a soldier of France was passing in the night. In the broader pools of summer moonlight he showed as a hale and husky fellow of about thirty years, with dark hair and eyes and a handsome, downcast face. His uniform was faded and dusty; not a trace of the horizon-blue was left; only a gray shadow. He had no knapsack on his back, no gun on his shoulder. Wearily and doggedly he plodded his way, without eyes for the veiled beauty of the sleeping country. The quick, firm military step was gone. He trudged like a tramp, choosing always the darker side of the road.