Established in 1924, it was bombed by the Royal Air Force on 21 March 1945, during Operation Carthage, when pilots mistook the school for their actual target, which was roughly 1.6 km (1 mi) to the east-northeast.
They had already established another school, the Institut Sankt Joseph in the Østerbro district of Copenhagen in 1858.
[1][2] The three-winged red-brick building, consisting of four stories and a mansard, housed 29 classrooms.
[4] One of the Mosquitos in the first of three waves hit a tall lamppost, causing it to crash into a garage close to the school, roughly 1.6 km (1 mi) to the west-southwest of the Shellhuset.
The remaining pupils were transferred to the Institut Sankt Joseph which was subsequently expanded.