character: Serbian Army
topic: Opposition faced by the Serbian Army during WWI
grade: 8
subject: History
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character: Austro-Hungarian Empire
topic: Military actions against the Serbian Army
grade: 8
subject: History
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character: Bulgaria
topic: Challenges for the Serbian Army on the Macedonian front
grade: 8
subject: History
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character: Central Powers
topic: Coalition against the Serbian Army in WWI
grade: 8
subject: History
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