Under his command the 8th Battery was led across the Jura and the Alps, bringing them to Alsace where they saw action before he was demobilized in Nimes. Delsarte now went to the Faculty of Sciences at Grenoble to replace Jean Favard, the professor of mathematics, who had been captured by the Germans and was being held as a prisoner of war in Germany.
Sa ilalim ng kanyang utos ng 8th baterya ay humantong sa Jura at ang Alps, nagdadala ang mga ito sa Alsace kung saan sila nakakita ng aksyon bago siya ay demobilized sa Nimes. Delsarte ngayon nagpunta sa Faculty of Sciences sa Grenoble sa palitan Jean Favard, ang mga propesor ng matematika, na nakuha na ng Germans at noon ay Idinaraos bilang isang bilanggo ng digmaan sa Alemanya.