You are right. I misidentified the gun. It is indeed a 14 cm (138.6 mm) Mle 1910. I corrected my notes long time ago but did not correct it here.

Seven (7) of these French guns were captured by the Germans at Verdun between the 23rd and 26th February 1916 including at La Vauche, Bois de Le Fay and Bois d'Herméville. The 2nd picture with all the visible logs could have been taken at Bois d'Herméville.

Emmanuel