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Arnaud had chosen to enter in the colonial infantry, and when Charles de Gaulle issued the Appeal of June 18 in 1940 for resistance against the Axis, he was a lieutenant stationed at Faya-Largeau in Chad and attached to the Régiment de Tirailleurs Sénégalais du Tchad (RTST), and on 26 August sided with de Gaulle, like all soldiers of the RTST.