Today is Hiroshima Day. On 6th August 1945, a nuclear bomb was dropped on an inhabited city as an act of war for the first time in human history.
On 6th August 1914, Austria-Hungary declared war on Russia, and Serbia declared war on Germany.
The Royal Serbian Ministry for Foreign Affairs wrote to the German legation at Niš:
The Royal Serbian Ministry for Foreign Affairs has the honour to inform the Imperial Legation that, in view of the state of war which now exists between Serbia and Austria-Hungary, and of that between Russia and Germany, the ally of Austria-Hungary, the Royal Serbian Government, in view of the solidarity of her interests with Russia and her allies, considers the mission of Baron Gieslingen, the Imperial German Minister Plenipotentiary and Envoy Extraordinary, to be at an end. The Royal Serbian Government requests His Excellency to leave Serbian territory with the staff of the Legations. The necessary passports are enclosed herewith.
Count Alexander von Hoyos, the Austro-Hungarian Foreign Minister, visited Berlin as a special emissary on 5th July 2014. He brought with him a handwritten letter from Emperor Franz Joseph, dated 2nd July, which was delivered to Kaiser Wilhelm II by the Austro-Hungarian Ambassador, Count de Szögyény-Marich. Also delivered was a memo from István Tisza, prime minister of Austria-Hungary, the only member of the Austro-Hungarian government to oppose the war with Serbia at that time.
The Emperor wrote:
I sincerely regret that You should have been obliged to give up Your intention of going to Vienna for the funeral ceremonies. I should have liked personally to express to You my sincerest thanks for Your sympathy in my keen sorrow — a sympathy which has greatly touched me.
By Your warm and sympathetic condolence You have given me renewed proof that I have in You a sincere friend worthy of confidence and that I may count upon You in every hour of grave trial.