Europe plunges into War

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What are the central powers
what are the allies
Why did the Italians change sides
What is the western front
What is the Schlieffen Plan?
What happened at Marne?What is the most important battle of the war, and why?
Explain trench warfare?
What is no man's land?
List and explain the new weapons of war.
Describe the eastern front.
What was bad for the Russian army.
what were it's strengths?