The Battle of Bucharest, also known as the Argeş-Neajlov Defensive Operation in Romania, was an important battle of the Romanian Campaign in World War I, in which the Central Powers occupied the Romanian capital and forced the Romanian Government, as well as the remnants of the Romanian Army to retreat to Moldova and re-establish its capital at Iaşi. The sheer number of troops involved, as well as the large area of operations, make it one of the most complex battles fought on Romanian soil during the war. Bucharest was eventually liberated after the Central Powers' surrender in 1918.