From 2–14 August, von Fersen was in Vienna to discuss the situation with Marie-Antoinette's brother Leopold, now Emperor. On 27 August 1791 the Declaration of Pillnitz was issued from Pillnitz Castle near Dresden; it declared the joint support of the Holy Roman Empire and Prussia for King Louis XVI against the Revolution but stipulated that Austria would only go to war if the other European powers followed them into war, which at this point in time was not likely to happen. Von Fersen wrote: