July Crisis in the context of "Balkan Wars"

World War I, or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a global conflict between two coalitions: the Allies (or Entente) and the Central Powers. Major areas of conflict included Europe and the Middle East, as well as parts of Africa and the Asia-Pacific. The war saw important developments in weaponry including tanks, aircraft, artillery, machine guns, and chemical weapons. One of the deadliest conflicts in history, it resulted in an estimated 30 million military casualties, and 8 million civilian deaths from war-related causes and genocide. The movement of large numbers of people was a major factor in the deadly Spanish flu pandemic.

The causes of World War I included the rise of the German Empire and decline of the Ottoman Empire, which disturbed the long-standing balance of power in Europe, the exacerbation of imperial rivalries, and an arms race between the great powers. Growing tensions in the Balkans reached a breaking point on 28 June 1914 when Gavrilo Princip, a Bosnian Serb, assassinated Franz Ferdinand, the heir to the Austro-Hungarian throne. Austria-Hungary blamed Serbia, and declared war on 28 July. After Russia mobilised in Serbia's defence, Germany declared war on Russia and France, who had an alliance. The United Kingdom entered the war after Germany invaded Belgium, and the Ottoman Empire joined the Central Powers in November. Germany's strategy in 1914 was to quickly defeat France before transferring its forces to the east, but its advance was halted in September, and by the end of the year the Western Front consisted of a near-continuous line of trenches from the English Channel to Switzerland. The Eastern Front was more dynamic, but neither side gained a decisive advantage, despite costly offensives. Italy, Bulgaria, Romania, Greece and others entered the war from 1915 onward.

Gavrilo Princip (Serbian Cyrillic: Гаврило Принцип, pronounced [ɡǎʋrilo prǐnt͡sip]; 25 July 1894 – 28 April 1918) was a Bosnian Serb student who assassinated Archduke Franz Ferdinand, heir presumptive to the throne of Austria-Hungary, and his wife Sophie, Duchess von Hohenberg, in Sarajevo on 28 June 1914. The assassination set off the July Crisis, a series of events that within one month led to the outbreak of World War I.

Princip was born in western Bosnia to a poor Serb family. Aged 13, he was sent to Sarajevo, the capital of Austrian-occupied Bosnia, to study at the Merchants' School. He later transferred to the gymnasium, where he became politically aware. In 1911, he joined Young Bosnia, a secret local society aiming to free Bosnia from Austrian rule and achieve the unification of the South Slavs. After attending anti-Austrian demonstrations in Sarajevo, he was expelled from school and walked to Belgrade, Serbia, to continue his education. During the First Balkan War, Princip traveled to Southern Serbia to volunteer with the Serbian army's irregular forces fighting against the Ottoman Empire but was rejected for being too small and weak. He also suffered from tuberculosis which was untreatable at the time and might have played a role in his motivation for the assassination.

The assassination of Archduke Franz Ferdinand was one of the key events that led to World War I. Archduke Franz Ferdinand of Austria, heir presumptive to the Austro-Hungarian throne, and his wife, Sophie, Duchess of Hohenberg, were assassinated on 28 June 1914 by Bosnian Serb student Gavrilo Princip. They were shot at close range while being driven through Sarajevo, the provincial capital of Bosnia and Herzegovina, formally annexed by Austria-Hungary in 1908.

Princip was part of a group of six Bosnian assassins together with Muhamed Mehmedbašić, Vaso Čubrilović, Nedeljko Čabrinović, Cvjetko Popović and Trifko Grabež coordinated by Danilo Ilić; all but one were Bosnian Serbs and members of a student revolutionary group that later became known as Young Bosnia. The political objective of the assassination was to free Bosnia and Herzegovina of Austro-Hungarian rule and establish a common South Slav ("Yugoslav") state. The assassination precipitated the July Crisis, which led to Austria-Hungary declaring war on Serbia and the start of World War I.

Although a member of the Triple Alliance, Italy did not join Germany and Austria-Hungary when the conflict started in 1914, on the ground that war was initiated by the two Central Powers while the Triple Alliance was a defensive bloc. Italians protested for the lack of consultation before Austria issued the ultimatum to Serbia and invoked a clause of the Triple Alliance, according to which both Italy and Austria-Hungary were interested in the Balkans and whoever changed the status quo in the region had to compensate the other; Austria-Hungary refused any compensation before the end of the war. In May 1915, after secret parallel negotiations with both sides, the Italians entered the war as one of the Allied Powers, hoping to acquire the Italian-speaking "irredent lands" of Trento and Trieste (in Italian discourse the conflict was described as the "fourth war of independence" against Austria) and other territories (German-speaking South Tyrol, the largely Slavic-speaking regions of Istria and Dalmatia where Italians lived in coastal cities, some colonial compensations) promised them by the allies in the 1915 treaty of London.

Italy opened a front against Austria-Hungary along the Eastern Alps and the Isonzo river. Fighting was marked by trench warfare and attrition. On the Julian sector, the Italian army launched numerous offensives and made several conquests (most significantly Gorizia in 1916 and Bainsizza in 1917), but both sides suffered heavy casualties. On the Asiago plateau, in 1916, an Austrian offensive was followed by an Italian counter-offensive. Italy was forced to retreat in 1917 by a German-Austrian offensive at the Battle of Caporetto, after the Russian collapse allowed the Central Powers to move reinforcements to the Italian Front from the Eastern Front.

Sophie, Duchess of Hohenberg (German: Sophie Marie Josephine Albina Gräfin Chotek von Chotkow und Wognin; Czech: Žofie Marie Josefína Albína hraběnka Chotková z Chotkova a Vojnína; 1 March 1868 – 28 June 1914) was the wife of Archduke Franz Ferdinand of Austria, the heir to the Austro-Hungarian throne. Their assassination in Sarajevo sparked a series of events that led, four weeks later, to World War I.

Dragutin Dimitrijević (Serbian Cyrillic: Драгутин Димитријевић; 17 August 1876 – 26 June 1917), better known by his nickname Apis (Апис), was a Serbian army officer and chief of the military intelligence section of the Royal Serbian Army general staff in 1913. He is best known as the main leader of the Black Hand, a paramilitary secret society devoted to South Slav irredentism that organised the 1903 overthrow of the Serbian government and assassination of King Alexander I of Serbia and Queen Draga. Many scholars believe that he also sanctioned and helped organize the conspiracy behind the assassination of Archduke Franz Ferdinand on 28 June 1914. This led directly to the July Crisis and the outbreak of World War I.

In 1916, the government in exile of Serbian Prime Minister Nikola Pašić, who considered Dimitrijević's refusal to compromise on South Slav irredentism to represent a serious threat to the secret peace negotiations taking place with Vienna during the Sixtus Affair, filed charges of high treason against the leadership of Unification or Death. Dimitrijević was tried in Thessaloniki before a Serbian Army court martial arraigned by his opponents within the Serbian government. He was found guilty of conspiring to assassinate both the Archduke and Prince Regent Alexander Karađorđević and executed by firing squad, along with two senior associates on 26 June 1917.