After weeks of delay, hesitation and complications, Austria-Hungary finally delivered its declaration of war on Serbia shortly after noon on 28 July 1914.

This, we are often told, represented the beginning of the First World War. But was it as straightforward as that? Contemporaries did not necessarily believe that all hope for peace had been lost. A degree of optimism remained, even in Berlin, where Russia's intervention was perceived possible, but not inevitable.

Now that Austria had made its choice, what would Russia choose to do? As we see, Sazonov was depressed and angry by the Austrian act. In this cynical mood, he took several steps which were designed to ratchet up the pressure on Vienna to hold back, and on Berlin to persuade its ally to do so. And there was no guarantee that Austrian and Serbian forces would even meet on the field.

Serbia had withdrawn its army to the interior, and Habsburg armies were only beginning to be mobilised. Another fortnight was required before the army would be ready, but where should this army go? Thanks to her poor infrastructure and woeful military durability, Austria found she had fewer options than expected once Russia refused to back down. The military and political aspects of her policy were thus intertwined, yet each was as badly understood as the other.

As Germany urged Vienna to give it some indication of what it would do, and Britain pressed for direct Austro-Russian negotiations, the world continued to operate as if yet another crisis in the Balkans would work itself out. Had it not happened before? In fact, this time the crisis was different, and the potential consequences far more catastrophic.

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