After Romania entered World War I in August 1916, Broșteanu was awarded the Order of Michael the Brave, 3rd Class,[6] for the way he led the 53rd Infantry Regiment during the Dobruja campaign in September–October 1916, being one of the twelve officers who were awarded the order for the first time: Having been dispatched by the divisional commander to maneuver to the left of the 2nd Division with his regiment, he knew how to ardently inspire the soldiers so that they proceeded singing to the assault.

100  In mid-January he entered Chișinău with the 11th Infantry Division, leading the Bolshevik units and their local supporters to leave the city, towards Bender (Tighina), on the Dniester River.

[2][8] By the beginning of February, Broșteanu's troops defeated the remaining Soviet units in Tighina, forcing them to retreat across the Dniester.

In March he was replaced by Ioan Rășcanu (his classmate at the Higher War School) as commander of the Romanian troops in Chișinău and central Bessarabia.

[5] After the war, he filled several key positions in the Army, such as commander of the Border Guards Corps (1922–1929) and General-Inspector of the Infantry (1929–1930).