These are in fact photos of the 15cm K.i.S.L. (or in some sources simply K.i.S.)�07 (Kanone in Schirm Lafette modell 1907) which was transported either on the trailer seen in the photos on the left towed by a tractor, or by rail, and used essentially as a railroad gun. When in the firing position the gun was as seen in the photos to the right with the AEF soldiers posing on the barrel.
