Battle of the Transdanubian Hills

The Battle of the Transdanubian Hills (also known in Bulgaria as the Drava Operation (Bulgarian: Дравска операция, Dravska operatsiya)) was a defensive operation of the Bulgarian First Army during Bulgaria's participation in World War II against German Wehrmacht forces, who were trying to capture the north bank of the Drava river as part of Operation Spring Awakening. Combat in the Transdanubian Hills lasted from 6 to 21 March 1945.

Source: Wikipedia — Battle of the Transdanubian Hills (CC BY-SA 4.0)