When Romania entered World War I in August 1916 on the side of the Allied powers, Avramescu fought with the Dobruja Army, under the command of Russian General Andrei Zayonchkovski, and saw action against the German forces of General August von Mackensen. In November he took command of the 2nd Battalion from the 38th Regiment, and fought in December at the Battle of the Argeș, falling back towards Moldavia in a series of defensive actions. For his valor in these engagements he was awarded in 1917 the Order of the Star of Romania, Knight class. In the summer of 1917 he fought at the Battle of Mărășești; for his service he was awarded the Order of the Crown, Grand Officer Class, and was promoted to major on 1 September 1917.