This dissertation examines the outbreak of the First World War in Graz by means of a microhistorical approach. The focus of this examination is directed on the public life in the city of Graz, whereas private life situations remain unattended. The observation period ranges from the assasination in Sarajevo to December 1914. The obtained information derives from magazines and booklets as well as from files and reports, which was essential to receive a diversified perspective on the topic. Intending to describe and explain the transformational process from a fragmentedly militarized society at peace to a martial society, this thesis analyses various war related aspects, such as war enthusiasm, the unification process, the so-called sense of duty as well as the population's concerns and fears. Consequently, this dissertation reveals that the social cohesion of the city has fundamentally changed during the first months of the war. Due to people's various different notations concernig the right way of living and, particularly, the proper way of warfare, countless conflicts as well as cooperations arose in the city. In the end the situation resulted in support and courtesy, but also in invectiveness, brawls, knifing and denunciations.