Assigned to the 15th "Dorobanți" Regiment in Piatra Neamț, Coroamă first saw action during the Second Balkan War of 1913. He was again called to action during the campaign of World War I, overseeing defensive maneuvers on the fortified lines of the Trotuș, Oituz, and Uz. By 1916, Coroamă was a Captain, and in full command the 3rd Infantry Battalion. He earned distinction following the Battle of Mărășești: he was cited on October 11, 1916 for his "initiative and energy in holding on to a difficult position", and, on December 27, was made a Knight of the Order of the Star of Romania. He continued to receive other distinctions, including the Order of Michael the Brave 3rd Class (presented by Eremia Grigorescu) and various medals of the Allied countries. He was later an Officer of the Star of Romania.