The two photographs on Page 13 were taken by an RE8 of 6 Squadron, part of the squadron's aerial reconnaissance operations over the Western Front during WW1.

 

The two photographs were were taken over the same 500 x 500 yard section of the Ypres-Commines railway line, as defined by the mapping coordinates 28. O. 6. A. The first photograph was taken on the 3rd May 1917 and the second on the 13th June 1917, 6 days after 19 mines were detonated beneath the German lines along the Messines ridge at the start of the Battle of Messines.