In the 1900s, the Austro-Hungarian empire had many nationalist movements seeking to achieve independence or greater power within the realm. One of those concerned Bosnia, a region in the Empire with a large Serbian population.
On June 28, 1914, the Archduke of the Austro-Hungarian Empire traveled to Sarajevo, which is now the capital of Bosnia-Herzegovina, on vacation. June 28 is the anniversary of the Battle of Kosovo, which became part of the national myth of Serbia, the Serbian equivalent of American Independence Day.
The symbol of Bosnian oppression visiting the city of Bosnia was not taken well with the Bosnian independence movements, including six members of Young Bosnia, a revolutionary movement in Austro-Hungarian Bosnia. They set out to assassinate Franz Ferdinand.
When he finally came to Sarajevo, the boys (none of them were that old) set their plan in motion. Each plan they had, though, and their backup plans, continued to fail. One of them threw an explosive at the open-topped car, but missed, a few others had the opportunity to kill the Archduke, but choked out of remorse, but finally, Gavrilo Princip shot him.
Totally serious title idea: Bosnian Shot Last
That’s why this could also work as a Prelude-to-WWI movie’s title.