- Span
- 28 June – 4 August 1914
- Place
- Sarajevo, Vienna, Berlin, St Petersburg, Belgrade
- Form
- Turning point — One chain of events, read in sequence.
- Published
- 2026-09-10
What made it possible
- The 1913 Balkan Wars had doubled Serbia's territory and alarmed Vienna, which had already considered a preventive war twice in 1912–13.
- The German and Austro-Hungarian general staffs had long argued that a war with Russia would only become harder to win as Russian railway and rearmament programmes matured — the 'now or never' argument.
- The Anglo-German naval race had ended in a de facto draw by 1912, but the two countries had no mechanism for discussing a Balkan crisis directly.
- Mobilisation timetables were rigid and mutually triggering: once Russia's general mobilisation began, German planning assumed war on two fronts within days.
Who acted
- Gavrilo Princip
- Bosnian Serb student, 19, who shot Franz Ferdinand and Sophie on 28 June
- Count Leopold Berchtold
- Austro-Hungarian foreign minister; drafted the ultimatum to Serbia in July
- Kaiser Wilhelm II
- Gave Austria-Hungary the 'blank cheque' on 5–6 July and then went on holiday
- Sergei Sazonov
- Russian foreign minister; pushed for partial then general mobilisation from 24 July
The thirty-seven days, and where they were decided
The crisis had two distinct phases. In the first, from 28 June to 23 July, Vienna and Berlin decided to settle accounts with Serbia and to do so even at the risk of a Russian war; the ultimatum was drafted to be unacceptable rather than to be accepted. In the second, from 24 July onwards, the other powers tried to manage a crisis whose direction they did not control, and the mobilisation timetables compressed the remaining options into days.
The decisive document is not the ultimatum but the record of 5–6 July, when the German leadership told Austria-Hungary it would back whatever it chose. Every later attempt at mediation ran into the fact that Vienna read that guarantee as permission and Berlin treated it as a contingency.
- 28 June: assassination.
- 5–6 July: German 'blank cheque' at Potsdam.
- 23 July: ultimatum delivered, 48-hour deadline.
- 25 July: Serbian reply accepted in substance; Vienna calls it insufficient.
- 28 July: Austria-Hungary declares war.
- 30 July: Russian general mobilisation.
- 1 Aug: German general mobilisation and war with Russia.
- 4 Aug: Britain declares war over Belgium.
Why mobilisation could not be paused
Mobilisation in 1914 was not a defensive posture that could be reversed cheaply. It meant moving millions of reservists, horses and guns onto rail networks built to a schedule that took days to execute and days more to undo. Russian plans assumed a general mobilisation because partial mobilisation would have left the Warsaw and Vilnius districts unprepared while committing Russia politically anyway.
The German plan was built around a swift strike westwards through Belgium before Russia could fully assemble, which meant that any Russian general mobilisation started a clock. This is why the diplomacy of late July was so frantic and so futile: the statesmen were working against a timetable the soldiers had drawn up years earlier.
What a hundred years of argument has settled
Historians no longer argue about a single guilty party in the way the 1919 war-guilt clause did. The mainstream position is a spread of responsibility: Austria-Hungary chose a military solution to a real security problem, Germany gave it cover and did not use its influence to restrain it, Russia chose to demonstrate resolve through mobilisation, and France and Britain made commitments that reduced their own freedom of action without doing much to deter.
What has also become clear is how contingent the outcome was. A dozen moments between 28 June and 4 August could have produced a negotiated outcome, and in most of them the alternative to escalation was visible and articulated at the time — Bethmann Hollweg's own private doubts, the Kaiser's last-minute hesitation, Grey's proposal of a London conference. They failed for reasons of political confidence rather than for lack of information.
Consequence: short and long
Immediately
Four empires went to war; by 1918 three of them — the Russian, Austro-Hungarian and Ottoman — had ceased to exist, and the fourth, the German, had lost its monarchy.
Over the long run
The war's most durable consequences were institutional: mass conscription, state-directed industry, income tax in Britain, and the practice of treating the whole economy as a war resource were all normalised between 1914 and 1918 and never fully rolled back. The peace settlements created the mandate system and the first attempt at a general international organisation, and drew borders in the Middle East and Eastern Europe that are still contested.
The usual misconception
That the war was inevitable because of the alliance system. Alliances did not fire automatically: Italy, a member of the Triple Alliance, stayed out in 1914 and then joined the other side in 1915, and Britain's entry came through Belgium rather than through any treaty obligation to France. The crisis became a war because specific people chose escalation at specific moments, above all at the 5–6 July meeting in Berlin.
Sources
- Christopher Clark, The Sleepwalkers: How Europe Went to War in 1914 (2012) — Reconstructs decision-making in each capital, with attention to the Balkan background.
- Margaret MacMillan, The War That Ended Peace (2013) — Follows the pre-war decade and the choices that narrowed over time.
- Luigi Albertini, The Origins of the War of 1914 (1952–57) — Three volumes of diplomatic documents, still the fullest chronology.
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