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Founded in 1850 as the first permanent military intelligence service in the world, the Evidenzbureau became active in the 1859 Austro-Sardinian war and the 1866 campaign against Prussia, albeit with little success.
The Evidenzbureau initially reported to the Austro-Hungarian Foreign Ministry, but was reassigned to the General Staff at the outbreak of World War I. It existed until the end of the monarchy in 1918.
The Kundschaftsbüro, tasked with monitoring foreign states, was subordinate to the Evidenzbureau.
Towards the end of the 19th century, tensions among the major European powers were rising, leading to increased activities of intelligence services. Mirroring political interests, attention of Austro-Hungarian services was primarily directed east- and southward (Russia and the Balkans); conversely, Russia was chiefly interested in affairs of Austria-Hungary and the German Reich.
The bureau collected intelligence of military relevance from various sources into daily reports to the Chief of Staff (Generalstabschef) and weekly reports to Emperor Franz Joseph; until 1913, the reports to the Emperor had to be submitted in longhand.
The core Bureau at the time consisted of 20 officers, a fraction of the numbers employed in the German or Russian services. This shortage was primarily because the service was part of the Foreign Ministry, which, as an [[k.u.k.|Imperial] institution, customarily received only the minimum acceptable amount of financing from the Hungarian side (see also Ausgleich).
In 1903, the Russian services succeeded in enlisting Col. Alfred Redl, General Staff officer and later head of counter-intelligence and deputy director of the Evidenzbureau, as a double agent. His discovery in 1913 led to a severe political and military crisis in Austria at the eve of World War I.
During that war, the importance of the Bureau was on the rise; the relatively new task of intercepting radio transmissions was added to its traditional functions such as mail censorship.
In the last year of the War (1918), the Evidenzbureau - then led by Maj. Maximilian Ronge - combined with the domestic intelligence service (Staatspolizei) is reported to have employed 300 officers, 50 officials, 400 police agents, 600 soldiers and 600 informants.
The fictional biography of Rex Stout's detective Nero Wolfe includes a reference to Wolfe - originally a Montenegrin - having acted as an agent of the Evidenzbureau in the years of increasing Balkan tensions leading to the outbreak of World War I.
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