He was three times wounded, promoted to captain, received the Croix de Guerre, and was made a member of Légion d'honneur.
After the war, Ferry was appointed by Georges Clemenceau to work on the reintegration of the provinces of Alsace-Lorraine which had been recovered from the German Empire.
In the 1919 elections, he stood as the junior candidate for the Chamber of Deputies on a list headed by future president Albert Lebrun.
On the outbreak of the Second World War, Ferry was recalled to service as the commandant of the 128th Fortress Infantry Regiment.
After having served and commanded fittingly, he died from pulmonary congestion in the freezing temperatures (less than -25C) on the Maginot line on 11 January 1940 aged 54.