An overall rise in Poznań’s population led to an increase in the number of school-age children. This put pressure on the municipal authorities to build new educational institutions to ensure adequate conditions for learning. As a consequence, in the 1870s, the authorities constructed Poznań’s first modern primary school at Św. Marcina Street. In the early 20th century, the Prussian authorities intensified their Germanisation policy in schools. A ban on the use of Polish in religion classes sparked student protests, which were particularly vehement in primary schools. Despite harassment and repressions from the authorities, 100,000 Polish children took part in the action. The greatest numbers of strikers in Poznań were from among the students of the city’s suburban schools. Although the protest was crushed by the authorities, it provoked a strong response throughout Europe.