Link to my translation (PDF) of En rase campagne, 1914; Un hiver à Souchez, 1915-1916 (Paris: Berger-Levrault, 1917)
Link to the original in Hathi Trust
The Battle of the Frontiers, August 1914; Photo credit: Wikipedia Commons
In the Great War, Jean Galtier-Boissière (1891-1966) served in the 31st infantry regiment, 20th brigade, 10th division, 5th corps, 3rd army. (That army was initially commanded by General Pierre Ruffey until 30 August 1914 and then by General Maurice Sarrail, 30 August 1914 – 22 July 1915). Later Galtier-Boissière was transferred to the 405th infantry regiment, 307th brigade, 130th division, 3rd infantry corps, 5th army, which was commanded by General Franchet d'Espèrey, 3 September 1914 - 31 March 1916. Galtier was serving his conscripted active duty military service when the war broke out, and he was automatically extended until the war ended (or he was disabled or died). His regiment’s barracks were located in the Paris suburbs at Melun (1st battalion) and fort de Romainville (2nd and 3rd battalions). This information comes from Jean Norton Cru, Témoins: essai d'analyse et critique des souvenirs de combattants (1929). See also the Wikipedia entry.
1931 photo of Jean Galtier-Boissière; photo credit from Wikipedia