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1.
What agreement held its members accountable to help one another in the event of an attack by two or more countries?
2.
What type of warfare did troops use to defend their positions and launch attacks during the deadlock on the Western front?
3.
What invention made air combat more possible and more deadly during World War I?
4.
What led to the end of fighting on the Eastern Front?
5.
What battle resulted in a major German defeat and marked the turning point of the war?
6.
On what date did Germany sign a peace treaty in the Palace of Versailles near Paris?
