26th July 1914
The leader of the Serbian Army, Field Marshall Radomir Putnik rushed back with one of his daughters to Serbia from his summer holiday in Austria-Hungary by train to Belgrade.
When passing Budapest, however, a number of officers entered his carriage and placed him under arrest. His release was eventually secured by Emperor Franz-Joseph in a chivalrous gesture.
Unfortunately for Franz-Joseph, Putnik would go on to direct the defence of Serbia against Austria-Hungary, driving the Austrians back out of Serbia by December 1914.