Final answer:
The Eastern Front in World War I was defined by mobility and rapid movement of armies compared to the static trench warfare of the Western Front.
Explanation:
The Eastern Front in World War I was marked by mobility unlike the Western Front, which was static trench warfare. The Russian, German, and Austrian armies in the east were highly mobile, aiming to outflank their enemies. This front was characterized by maneuverability and rapid movement as opposed to the stagnant trench warfare in the west.
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