Born in Rennes, Boulanger graduated from Saint-Cyr and entered regular service in the French Army in 1856. He fought in the Austro-Sardinian War (he was wounded at Robecchetto con Induno, where he received the Légion d'honneur), and in the occupation of Cochin China, after which he became a captain and instructor at Saint-Cyr. During the Franco-Prussian War, Georges Boulanger was noted for his bravery, and soon promoted to chef de bataillon; he was again wounded while fighting at Champigny-sur-Marne (during the Siege of Paris). Subsequently, Boulanger was among the Third Republic military leaders who crushed the Paris Commune in April–May 1871. He was wounded a third time as he led troops to the siege of the Panthéon, and was promoted commandeur of the Légion d'honneur by Patrice Mac-Mahon