For three days in January 1942, the Hungarian military and gendarmes forced over 1200 Jews and Serbs to the banks and bridges overlooking the frozen Danube River. The ice was shelled. The people were robbed, many were shot, and groups of adults, children, and the elderly (bound with piano wire) were pushed to their deaths through the ice into the river. Bodies washed up for many months afterwards as spring arrived and summer began.

It is believed that Admiral Miklos Horthy, leader of Hungary, was aware of the raid and approved the action. However, at the Nuremberg trials, the Soviets and the Americans pressed that all charges of him be dropped.

Further Reading https://en.wikipedia.org/wiki/Novi_Sad_raid

detail, Novi Sad