Question: The Nagato-class battleship participated in the Second Sino-Japanese war under which Marshal Admiral of the Japanese Navy?
Context: Isoroku Yamamoto (山本 五十六 , Yamamoto Isoroku , April 4, 1884 – April 18, 1943) was a Japanese Marshal Admiral of the Navy and the commander-in-chief of the Combined Fleet during World War II until his death. Ryūjō (Japanese: 龍驤 "Prancing Dragon") was a light aircraft carrier built for the Imperial Japanese Navy (IJN) during the early 1930s.  Small and lightly built in an attempt to exploit a loophole in the Washington Naval Treaty of 1922, she proved to be top-heavy and only marginally stable and was back in the shipyard for modifications to address those issues within a year of completion.  With her stability improved, "Ryūjō" returned to service and was employed in operations during the Second Sino-Japanese War.  During World War II, she provided air support for operations in the Philippines, Malaya, and the Dutch East Indies, where her aircraft participated in the Second Battle of the Java Sea.  During the Indian Ocean raid in April 1942, the carrier attacked British merchant shipping with both her guns and her aircraft.  "Ryūjō" next participated in the Battle of the Aleutian Islands in June.  She was sunk by American carrier aircraft at the Battle of the Eastern Solomons on 24 August 1942. Nagato (長門 ) , named for Nagato Province, was a super-dreadnought battleship built for the Imperial Japanese Navy (IJN) during the 1910s.  The lead ship of her class, she carried supplies for the survivors of the Great Kantō earthquake in 1923.  The ship was modernized in 1934–36 with improvements to her armor and machinery and a rebuilt superstructure in the pagoda mast style.  "Nagato" briefly participated in the Second Sino-Japanese War in 1937 and was the flagship of Admiral Isoroku Yamamoto during the attack on Pearl Harbor.  She covered the withdrawal of the attacking ships and did not participate in the attack itself. Mitsugu Mori (森 貢 , Mori Mitsugu ) was an officer and ace fighter pilot in the Imperial Japanese Navy (IJN) during the January 28 Incident, the Second Sino-Japanese War, and the Pacific theater of World War II.  As a member of the 12th Air Group during the Second Sino-Japanese War, Mori was officially credited with destroying four Chinese aircraft in aerial combat. Shirataka (白鷹 , "White Hawk" ) was a medium-sized minelayer of the Imperial Japanese Navy, which was in service during the Second Sino-Japanese War and World War II.  She was the world's first purpose-built anti-submarine netlayer.  Also, unlike any other warship in the Japanese Navy, she had two chrysanthemum crests due to her unusual bow configuration. Men Bingyue (; 1890–1944) was a general in the Chinese National Revolutionary Army during the Second Sino-Japanese War.  As commander of the 7th Cavalry Division he participated in the Suiyuan Campaign in 1936, defeating the Japanese backed Inner Mongolian Army.  After the beginning of the Second Sino-Japanese War in 1937 he was made Commander of the 6th Cavalry Army, fighting in the Battle of Taiyuan defending Suiyuan.  In 1940 he was made Deputy Commander in Chief of the 17th Army Group.  In 1941, he was made Commander of the 7th Cavalry Army.  He died in August 1944 in Chongqing. The 102nd Infantry Regiment was an infantry regiment in the Imperial Japanese Army.  The regiment was at one stage attached to the 128th Infantry Brigade, of the 114th Division, in the Tenth Army during the Second Sino-Japanese War.  The regiment was later attached to the Eastern District Army on 7 September 1940, then the Kwantung Army on 1 August 1941, then assigned to the Twenty-Third Army on 19 September 1941 and the Eighteenth Army in November 1942.  The regiment participated during the Second Sino-Japanese War and during the later stages of World War II, the regiment was in New Guinea, taking part in the New Guinea campaign. The "Nagato"-class battleships (長門型戦艦 , Nagato-gata senkan ) were a pair of dreadnought battleships built for the Imperial Japanese Navy (IJN) during World War I, although they were not completed until after the end of the war.  "Nagato" , the lead ship of the class, frequently served as a flagship.  Both ships carried supplies for the survivors of the Great Kantō earthquake in 1923.  They were modernized in 1933–36 with improvements to their armor and machinery and a rebuilt superstructure in the pagoda mast style.  "Nagato" and her sister ship "Mutsu" briefly participated in the Second Sino-Japanese War in 1937 and "Nagato" was the flagship of Admiral Isoroku Yamamoto during the attack on Pearl Harbor on 7 December 1941 that began the Pacific War. Itsukushima (厳島 ) was a medium-sized minelayer of the Imperial Japanese Navy, which was in service during the Second Sino-Japanese War and World War II.  She was named after the First Sino-Japanese War-era cruiser "Itsukushima" , which in turn was named after Itsukushima, a sacred island in Hiroshima Prefecture of Japan.  She was the first warship in the Imperial Japanese Navy with all diesel engine propulsion. Ning Hai () was a light cruiser in the Republic of China Navy (ROCN) before World War II and the lead ship of her class.  She was sunk in the early days of the Second Sino-Japanese War by aircraft from the Imperial Japanese Navy, and her wreck was raised and repaired by the Japanese, re-entering service with the Japanese Navy in the Pacific War as the escort vessel Ioshima (五百島 ) .  She was sunk again in September 1944 by a USN submarine.
Answer: Isoroku Yamamoto