Alliances were a large part of World War One. The Triple Alliances consisted of Germany, Austria- Hungary and Italy. Another alliance group was the Triple Entente which consisted of Britain, France and Russia.
major battles in one major battle was The second battle of Ypres in April 1915 was the only major German attack in of the year. To break through the trench lines, the Germans used poison gas for the first time. allowing them to advance several miles.