German soldiers preparing ammunition for 38 cm SK L/45 “Max” a.k.a. “Langer Max” (on the background). Originally built as a naval gun, it was adapted for land service on the Western Front.
Initially, these guns saw action in fixed positions at Verdun in February 1915. A railroad mount was designed later to increase its mobility, and as railroad guns, they participated in the 1918 Spring Offensives and the Second Battle of the Marne.
Seven examples of “Langer Max” survived the war but were destroyed in the early1920s.