 He officially entered École d'Artillerie (Artillery School) at Châlons-sur-Marne on 5 March 1794, and was commissioned as Second Lieutenant in the First Foot Artillery Regiment by 13 November of that same year.During his time in the Army, Servois was actively involved in many battles, including the crossing of the Rhine, the Battle of Neuwied, and the Battle of Paris.It was during his leisure time in the army that he began to seriously devote himself to the study of Mathematics.