In August 1914, France had already defined a pattern of war aims which would be shaped and amended during the next four years. Regarding East-Central Europe, two approaches present themselves to the French policy-makers: the classic system of alliances to maintain the balance of power, and the new internationalist doctrine implying the priority application of the principle of nationality. Both these concepts reacted to the geopolitical evolutions which occurred during the Great War. The article analyses these evolutions of the French concept of a ‘world order’ in East-Central Europe between 1914 and 1918 primarily through an examination of the case of Poland.