He campaigned for the dangers of chemical warfare to be considered and was eventually appointed as a medical consultant of the 8th Army during World War II.

He showed "his bravery and [...] his composure, [...] his innate sense of command and organisation, but also [...] his deeply human qualities of dedication to the wounded".

[6] In July 1915, he received a new assignment, in a front ambulance and he has been proposed three times for the Legion of Honour (9 November 1914 for "beautiful driving in Lorraine and during the fighting of Izel-Les-Equerchin and Douai", renewed in January and March 1915).

Assigned to Ambulance Z, responsible for caring for gassed soldiers to the point of being hospitalized, and he published many notes on the effects of combat gases.

When the Armistice occurs, he was appointed doctor-consultant of the 10th army led by the General Mangin, a position in which he was faced with the risk of the epidemic typhus and Spanish flu.

Alerted, he organised his escape, but worried about the consequences that his disappearance could have for his relatives and students, he gave himself, on 4 June 1944 at 4 a.m., to the Germans who came to arrest him.

[7] At the end of the First World War, he agreed to teach general and experimental pathology at the Nancy Faculty of Medicine.

[14][10] The development of the OHS continued throughout the 1920s, with the support of local partners, legacies of individuals, but also, in 1921, the Rockefeller Foundation, of which a member regrets, in a 1939 report, that the Lorraine example was not further used in France.

[15] Gradually, other pathologies are taken care of: syphilis, alcoholism, infant mortality, cancer: the approach now consists in engaging "a real policy of public health thought on a territorial scale".

- and using the media: leaflets, posters, cinema are mobilised to disseminate prevention messages to the general public, in addition to the scientific communication provided by the journal created at the initiative of Jacques Parisot, the Review of Hygiene and Social Prophylaxis, which was published from 1922 to 1939.

[19] In 1942, he created the Commission for the Reclassification of Physical Decreases, having had the opportunity, during missions carried out as part of the International Labour Office, sequelae related to occupational accidents and disabling diseases.

This project, discussed, finally led, on 28 November 1952, to the idea of an Institute for Social and Vocational Rehabilitation of the physically disabled.

[23] This naturally led him to participate, in 1945-1946, in the creation of the World Health Organization (he is, for France, the signatory to the constitution of the organisation).

[26][27][28] He was elevated to the ultimate dignity of Grand Cross of the Legion of Honor on 3 March 1953,[29] and awarded the Léon Bernard Foundation Prize in 1954.

Among the interventions presented on 14 February 1968, on the occasion of the solemn ceremony in memory of Jacques Parisot, in the Grand Amphitheatre of the Sorbonne, that of the general practitioner Raymond Debenedetti, member of the National Academy of Medicine and then President of the French Red Cross, entitled The Patriot,[6] traces the journey of a courageous and patriotic soldier during the two conflicts of the 20th century.