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The two photographs on Page 2 were taken by an RE8 of 6 Squadron, part of its aerial reconnaissance  operations over the Western Front during WW1.

 

The photographs show a section of the Ypres-Comines railway cutting, as defined by the mapping coordinates 28. I. 35. B and - 28. I. 35. D an area measuring 500 yards east/west and 1000 yards north/south. The first photograph was taken on the 17th March 1917 and the second on the 13th June 1917, 6 days after the 19 mines were detonated beneath the German lines along the Messines ridge.