How did the war on the Eastern Front differ from the war on the Western Front?
The war on the Western Front quickly turned into a stalemate, as neither the Germans not the French could dislodge each other from the trenches they had dug for shelter. The Western Front had become bogged down in trench warfare that kept both sides in virtually the same positions for four years.
In contrary to the Western Front, the war on the Eastern Front was marked by mobility. (Page 722, ‘The Western Front’ and ‘The Eastern Front’)