Two more pictures of Schneider built 280mm mortars.
The top picture looks like a factory setting, or a training exercise. The second is a coloured photograph from 1914.
This picture is of 154 Regiment Artillerie Positional (RAP) taken at Christmas 1939, during the drole de guerre.
As I mentioned yesterday, these WW1 mortars were still in use in 1939/40. In June 1940, it was two batteries, each of two mortars, of 154 RAP that smashed Italian observation posts on the top of Chaberton.