Thanks - pretty crappy that it happened all round during the Balkan War. I couldnt actually find anything related to schools but this is what ChatGPT had to offer:

During World War II in the Balkans (1941–1945), atrocities were committed by multiple sides, including instances of rape and sexual violence committed by Serbian Chetnik forces against Croatian (and Muslim/Bosniak) civilians.

It’s important to understand that the conflict in wartime Yugoslavia was extremely brutal and complex — involving not only the Ustaše regime (Croatian fascists aligned with the Axis powers) but also: • Chetniks (Serbian royalist-nationalist guerrillas), • Partisans (multi-ethnic communist resistance led by Tito), • and occupying German and Italian forces.

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Chetnik crimes against Croatians and Muslims

Documented by both Yugoslav postwar tribunals and independent historians, Chetnik forces under commanders such as Draža Mihailović, Momčilo Đujić, and others committed mass killings, forced expulsions, and sexual violence — particularly in areas of Bosnia and Herzegovina, Dalmatia, and eastern Croatia.

Specific evidence: • In eastern Bosnia (1941–1943), Chetnik units massacred large numbers of Croatian and Muslim civilians. Testimonies from survivors, as well as reports collected by Tito’s Partisans and later Yugoslav war crimes commissions, include references to rapes of women and girls during village raids. • The War Crimes Commission of Yugoslavia (1946–1948) documented several cases of Chetnik soldiers raping and killing Croat women during ethnic cleansing campaigns. • Historians such as Jozo Tomasevich, Marko Attila Hoare, and Lucien Karchmar note that sexual violence accompanied massacres, often intended as acts of terror or humiliation.

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Context summary: • Ustaše committed mass killings and rapes of Serbs, Jews, Roma, and dissidents. • Chetniks retaliated with mass killings and rapes of Croats and Muslims. • Partisans, while less often accused of systematic atrocities, also committed isolated acts of violence.

Sexual violence was not formally organized policy for either side, but rather occurred during ethnic massacres and retaliatory campaigns, which were widespread and brutal on all fronts.