In case of what country's attack was the origins of the Central Powers?
Dual Alliance (1879) The Dual Alliance was a defensive alliance between Germany and Austria-Hungary, which was created by treaty on 7 October 1879 as part of Bismarck's system of alliances to prevent or limit war. The two powers promised each other support in case of attack by Russia. Also, each state promised benevolent neutrality to the other if one of them was attacked by another European power (generally taken to be France, even more so after the Franco-Russian Alliance of 1894). Germany’s Otto von Bismarck saw the alliance as a way to prevent the isolation of Germany and to preserve peace, as Russia would not wage war against both empires.
Paris in World War II Paris started mobilizing for war in September 1939, when Nazi Germany invaded Poland, but the war seemed far away until May 10, 1940, when the Germans attacked France and quickly defeated the French army. The French government departed Paris on June 10, and the Germans occupied the city on June 14. During the Occupation, the French Government moved to Vichy, and Paris was governed by the German military and by French officials approved by the Germans.