 Complete the following phrase:  During the Romanian Campaign of World War I, Cristescu was Chief of Staff of the 2nd and 3rd Romanian Armies and later of Army Group General Averescu. From 10 November to 5 December 1916 he was Commander of the Northern Army. In 1917 he was promoted to major general. In June of that year he took command of the Romanian 1st Army, during the operations leading up to the 