pm (22:20) on September 18, the explosives were detonated. However, the explosion was minor and only a 1.5-meter section on one side of the rail was damaged. In fact, a train from Changchun passed by the site on this damaged track without difficulty and arrived at Shenyang at 10:30 pm (22:30). On the morning of September 19, two artillery pieces installed at the Mukden officers' club opened fire on the Chinese garrison nearby, in response to the alleged Chinese attack on the railway. Zhang Xueliang's small air force was destroyed, and his soldiers fled their destroyed Beidaying barracks, as five hundred Japanese troops attacked the Chinese garrison of around seven thousand. The Chinese troops were no match for the experienced Japanese troops. By the evening, the fighting was over, and the Japanese had occupied Mukden at the cost of five hundred Chinese lives and only two Japanese lives, thus starting the greater invasion of Manchuria. Initial annexation On September 18, 1931, the Japanese Imperial General Headquarters, which had decided upon a policy of localizing the incident, communicated its decision to the Kwantung Army command. However, Kwantung Army commander-in-chief General Shigeru Honjō instead ordered his forces to proceed to expand operations all along the South Manchuria Railway. Under orders from Lieutenant General Jirō Tamon, troops of the 2nd Division moved up the rail line and captured virtually every city along its length in a matter of days. Likewise on September 19, in response to General Honjō's request, the Joseon army in Korea under General Senjūrō Hayashi ordered the 20th Infantry Division to split its force, forming the 39th Mixed Brigade, which departed on that day for Manchuria without authorization from the Emperor. On September 19, the Japanese occupied Yingkou, Liaoyang, Shenyang, Fushun, Dandong, Siping (Jilin Province), and Changchun. On September 21, the Japanese captured Jilin City. On 23 September, the Japanese took Jiaohe (Jilin) Province) and Dunhua. On 1 October, Zhang Haipeng surrendered the Taonan area. Sometime in October, Ji Xing (吉興) surrendered the Yanbian Korean Autonomous Prefecture area and on 17 October, Yu Zhishan surrendered Eastern Liaoning to the Japanese. Tokyo was shocked by the news of the Army acting without orders from the central government. The Japanese civilian government was thrown into disarray by this act of "gekokujō" insubordination, but as reports of one quick victory after another began to arrive, it felt powerless to oppose the Army, and