raid offensives executing Schlieffen Plan, expecting a quick victory over the Allies; but the German were stopped in the battle of Marne by British and French armies.-The war of positions (1915-1917). Trench warfare in 1915, the western front between Germany and the Allies established and war of attrition began. - Crisis and ending: the Central Power´s defeat (1918). Russian withdrew from the war due to its Communist Revolution; the new government signed the Treaty of Brest-Litovsk. In the Treaty Russia had to cede to Germany the Baltic States and others territories; Finland, Poland, Ukraine, Latvia, Estonia, Lithuania.