Great War. After the war, Hiei was converted into a training ship to comply with the terms of the Washington Naval Treaty. She was converted back into a combat ship and upgraded in the late 1930s, and took part in the Sulu Sea Confrontation against the United States in 1940. Mindful of the age of the ship, the Imperial Japanese Navy elected to rid themselves of the Hiei and her sister Kirishima when replacements for these ships could be built. It was during this replacement time that the Argentine government approached the Japanese, requesting to buy both the Hiei and Kirishima as part of the Second South American naval arms race. The Japanese agreed, and Hiei was transferred to the Argentine Navy in 1944 and renamed ARA San Martín.