1918-1934
That answer is rubbish! Austria was part of Germany until 1866. Germany untied with Austria as allies in World War One, and in World War Two, Hitler formed an 'Anschluss', or pact, giving over power of Austria to him, so technically Austria was never invaded by Germany, because they allied with Germany.
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The question as posed does not really make sense. It was the Russian defense of Serbia against Austria-Hungary's invasion that started World War 1. The German declaration of war against Russia then triggered the alliance of the Triple Entente, expanding the reach of the conflict. Once the Triple Entente was involved, the Germans wanted to invade France. But in order to do so and outflank the French forces on the German/French border, they had to invade the north of France, going first through Belgium. So Belgium was the first country to be invaded.
Austria was militarily far better organized than France was at the time. Robespierre fully expected France to be defeated by the Austrians should war commence.
No, but he conquered France, Germany, and Switzerland, Austria, and Belgium.
Poland.
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