Sources

Positions françaises : Journaux des Marches et Opérations

Positions allemandes et Belges : Site Sambre-Marne-Yser

Positions allemandes :

"Histories of two hundred and fifty-one divisions of the German army which have participed in the war (1914-1918)"

Positions anglaises : "History of the Great War - Military opérations" Sir James E. Edmonds