The Tenth Army, first called détachement d'armée Maud'huy, was formed on 1 October 1914 during the Race to the Sea.
[1] [2] The Italians had been pushed back at the Battle of Caporetto by German Army reinforced Austro-Hungarian divisions.
The two divisions of 12th Army Corps under command of Jean César Graziani remained in Italy until the end of the war.
This is why a new 10th Army was formed to hold the front at the Lower Seine and placed under command of General Robert Altmayer (1875 - 1959).
His troops were not yet in place when the Germans appeared at the Seine on 9 June and immediately crossed it in the Portejoie, Saint-Pierre-du-Vauvray and Venables sector.