Question: What is the name of the war in which the 4th Infantry Regiment of the Imperial Japanese Army fought the Republic of China from July 7, 1937 to September 9, 1945?
Context: The 4th Infantry Regiment was an infantry regiment in the Imperial Japanese Army.  The regiment was attached to the 2nd Division.  The regiment was raised at Sendai on 14 May 1888.  The regiment participated during the Second Sino-Japanese War, and World War II. The 52nd Infantry Division ("52.Infanterie-Division") was a division of the Imperial German Army during World War I.  The division was formed on March 6, 1915, from units taken from other divisions or newly raised.  The division was initially mixed, with two infantry regiments from the Grand Duchy of Baden, one infantry regiment from Prussian Saxony, and Prussian and Baden support units (cavalry, artillery, engineers, and service and support units).  While the infantry regiments and the divisional cavalry squadron were regular army units, the rest of the division was made up of reserve units and units formed during the war.  The 66th Magdeburg Infantry Regiment was taken from the 7th Infantry Division, and the 169th and 170th Infantry Regiments were taken from Baden's 29th Infantry Division.  The 52nd Infantry Division became more Baden as the war progressed, as the 66th Magdeburg Infantry Regiment, the regiment from Prussian Saxony, was replaced on April 6, 1917, by Baden's 111th Infantry Regiment "Margrave Ludwig Wilhelm". The 53rd Infantry Regiment was an infantry regiment in the Imperial Japanese Army.  The regiment was attached to the 17th Infantry Brigade of the 17th Division and participated during the Second Sino-Japanese War as part of the Central China Expeditionary Army, before being assigned to the Thirteenth Army.  The regiment fought in the later stages of World War II, assigned to the Japanese Eighth Area Army at Bougainville Island in the Solomon Islands. The 54th Infantry Regiment was an infantry regiment in the Imperial Japanese Army.  The regiment was attached to the 17th Infantry Brigade of the 17th Division and participated during the Second Sino-Japanese War as part of the Central China Expeditionary Army, before being assigned to the Thirteenth Army.  The regiment fought in the later stages of World War II, assigned to the Japanese Eighth Area Army at Bougainville Island in the Solomon Islands. The 78th Infantry Regiment was an infantry regiment in the Imperial Japanese Army.  The regiment was attached to the 39th Infantry Brigade of the 20th Division.  The regiment participated during the Second Sino-Japanese War and during the later stages of World War II, the regiment was in New Guinea, as part of the Japanese Eighteenth Army. 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. Morozumi was born in Nagano prefecture.  He graduated from the 22nd class of the Imperial Japanese Army Academy in May 1905, serving initially with the IJA 58th Infantry Regiment, a new regiment which had been raised as a reserve force in the closing stages of the Russo-Japanese War.  As a second lieutenant, he returned to the Army’s Infantry Warfare School, where he specialized in armor.  His rise through the ranks was uneventful, serving a staff post with the Inspectorate General of Military Training, and a field posting as battalion commanders within the IJA 59th Infantry Regiment, IJA 1st Infantry Regiment, IJA 29th Infantry Regiment and IJA 65th Infantry Regiments and as commander of the Hongo Regimental District.  The IJA 65th Regiment was one of the units at the Battle of Nanking in 1937 during the Second Sino-Japanese War and was accused of the massacre of prisoners of war following the battle's end. The Second Sino-Japanese War was a military conflict fought primarily between the Republic of China and the Empire of Japan from July 7, 1937 to September 9, 1945.  It began with the Marco Polo Bridge Incident in 1937 in which a dispute between Japanese and Chinese troops escalated into a battle.  The conflict then escalated further into a full-scale war.  It ended with the unconditional surrender of Japan on September 2, 1945 to the Allies of World War II. The 45th Infantry Regiment was an infantry regiment in the Imperial Japanese Army.  The regiment was attached to the 6th Infantry Brigade of the 6th Division and participated during the Second Sino-Japanese War.  The regiment fought in the later stages of World War II, assigned to the Japanese Seventeenth Army at Bougainville Island in the Solomon Islands. The 13th Infantry Regiment was an infantry regiment in the Imperial Japanese Army.  The regiment was attached to the 6th Infantry Brigade of the 6th Division and participated during the Second Sino-Japanese War.  The regiment fought in the later stages of World War II, assigned to the Japanese Seventeenth Army at Bougainville Island in the Solomon Islands.
Answer: Second Sino-Japanese War