On 24 July 1914, the Austro-Hungarian Ambassador to France, Nikolaus Count Szecsen (pictured), sent a coded telegram to the Austro-Hungarian Minister of Foreign Affairs, Leopold Count Berchtold. In his telegram, Szecsen informs Berchtold of the declaration of support of the German Ambassador to France towards Austria-Hungary.
Count Szecsen to Count Berchtold. Paris, 24 July 1914.
Baron Schoen [the German Ambassador to France] has been instructed to inform this government [i.e the French Republic] that according to the opinion of the cabinet of Berlin, our controversy with Servia is a concern which exclusively regards the two governments implicated.
He is also to give the government to understand that in case that third States would interfere, Germany would be faithful to its duties as an ally and would place itself on our side.
The German ambassador will make this communication today.
Source: 1919 Austro-Huungarian Red Book, with minor edits.