Drina Border river between Bosnia-Herzegovina and Serbia. The battle of the Drina (August 12–21, 1914) was, for Austria-Hungary, the most unfortunate conceivable prelude to the war against Serbia. The prime cause was the incomplete deployment of the Austro-Hungarian forces. The forces ranged against Serbia comprised not only the Fourth and Fifth Armies, but also the Second Army, which had been earmarked for use against the Russians in the event of the opening of a second front in Galicia. However…

Karl I, Emperor of Austria (August, 17, 1887, Persenbeug [Lower Austria] – April 1, 1922, Quinta do Monte [Madeira]), Emperor of Austria, King of Hungary (Charles IV). Due to the death of the heir apparent Archduke Franz Ferdinand on June 28, 1914, Archduke Karl was suddenly compelled to assume the role of the successor to the throne without careful preparation, and thus too early. In view of the brevity of Emperor Franz Joseph’s remaining life expectancy, young Karl’s military assignment was above a…