Eventually, in summer 1916, Premier Brătianu discarded his reservations, and Romania entered the war as an Entente country. While Constantin became tasked with ensuring a direct Russian military involvement and military aid for the Romanian Front, George again volunteered for military service. He was reputedly enrolled as a private, but was seen traveling with his own orderly. He was detached to the Second Army commandment in the Southern Carpathians, where he held conference with General Alexandru Averescu and other officers. Averescu remembered him as a shady figure, not worthy of his trust, and noted in particular Diamandy's ideas about using expanding bullets against the Austro-Hungarian Army (which had reportedly initiated their use in combat). Diamandy saw action in the front-line trenches, but was still plagued by his lung and heart problems, and was eventually sent to a hospital behind the lines. By then, the Diamandys' forecasts about Bulgarian neutrality and Romanian readiness for war proved misguided, with Romania suffering a scathing defeat in the Battle of Turtucaia.