Between 1940 and 1944, the departments of the Nord and of the Pas-de-Calais were attached to the German Military Command of Brussels. As early as June 1940, military courts are in charge of repressing the actions of opposition to the presence of the occupying forces, within the jurisdiction of Lille's 670 Oberfeldkommandantur. Often understood as essentially arbitrary, repression is on the contrary fundamentally judiciary. Through the study of the global sentencing (deportations, executions and internments) one can make out a tit-for-tat response of the German authorities to the major periods of opposition. In the end, the issue of the responsibility of the military authorities must be raised, included when extra-judiciary procedures were resorted to in coordination with the police branch of the SS.