In 1914, Eulenburg welcomed and supported World War I, and was particularly proud of the way the German government made it appear that Russian mobilization had forced war on Germany. In a letter, Eulenburg wrote:"'We were forced into the War by Russia'; so people think-and so they "are supposed" to think. The manner in which this "fact" was demonstrated to us by means of documents had a Bismarckian touch that appealed to me; was it Bethmann? Jagow? Zimmermann? I do not know. My guess is Zimmermann plus Jagow." Eulenburg felt that the Austrian ultimatum to Serbia was "Prussian to the marrow" since its terms were cleanly meant to inspire rejection and he believed that nobody in the Austrian government was capable of writing such an ultimatum without German prompting. Eulenburg wrote that: