At the end of World War I, in 1917-18, the Kale was seat to the headquarters of the Austrian army. Traces of this stay are discovered in the topmost layers of the Kale in the form of guns and other small military.
After the formation of Yugoslavia, in the period between 1921-30, about 10 massive military buildings were built on the Kale: general staff headquarters, barracks, warehouses and other. These occupied the place until 1951 when the army was withdrawn from the Kale, and the buildings were taken over by the Archaeological and Historical Museum. In the earthquake of 1963, all of these buildings were demolished forming a debris layer with thickness up to several metres at points.
With our excavations we found the foundations and basements of these buildings. Some of them were preserved in testimony of the youngest life stage of the Skopje Fortress, before the disastrous earthquake from 1963.