In 1791, when the Revolutionary government required all clergy to take an oath of loyalty to the state, the seminary disbanded and Dujarié returned home.
In July 1795, Dujarié resumed his studies for the priesthood in secret with Joseph Jacquet de la Haye, pastor in Ruillé-sur-Loir.
[2] Throughout the Revolutionary period he ministered to the Catholic faithful as an "underground priest" throughout northwestern France, particularly in the countryside around Ruillé-sur-Loir, in the former province of Maine.
As their numbers grew, Dujarié sent them to Anne de la Girouardière, founder of the Daughters of the Sacred Heart of Mary for formation in religious life and training in the care of the sick.
With the encouragement of Johann Michael Josef von Pidoll de Quitenbach, Bishop of Le Mans, in 1820 Dujarié also founded the Brothers of St. Joseph for the education of rural boys.
In August 1835 Jean-Baptiste Bouvier, Bishop of Le Mans presided over a ceremony in the chapel of the Grand Saint-Joseph, in which Dujarie presented Moreau as the new head of the organization.
After a building expansion and renovation in the spring of 1837 he also brought to the property the Auxiliary Priests, and they were formally united with the Brothers to form the Association of the Holy Cross.