Farman Aeroplanes at an altitude of 350 feet regulating French artillery at Dean Mans Hill, during the retaking of this position, in January of 1917. In the foreground, a German trench may be seen, partly torn up. The clouds are hardly 700 feet above the ground, which makes it necessary for French machines to fly very low. They often find themselves in the trajectory of te shells and are frequently hit by shrapnel. The detonations of exploding shells follow each other, like the roll of great drums, resembling the crashes of discordant thunder.
