The deployment of the Northeast Army in China at the outbreak of the September 18 Incident

The 12th Independent Brigade, commanded by Zhang Tingshu, stationed in Jinxian County

The 20th Independent Brigade is commonly stationed at Zhengjiatun

1st Brigade of Provincial Cavalry, Wang Nanping's Unit, stationed in Suihua

Public Security General Corps (transformed from the former 20th Division) Huang Xiansheng Unit, stationed in Shenyang

The 1st Brigade of the Provincial Defense, led by Sun Hexi, is stationed in Fangzheng

After the change of banners in Northeast China, the Northeast Army was organized into 25 infantry brigades, 6 cavalry brigades, and 10 artillery regiments. In September 1930, Zhang Xueliang supported Chiang Kai-shek in the Central Plains War, deploying 9 elite brigades totaling 100,000 men to form two armies, with Xuezhong and Wang Shuchang leading them into the pass. After the conclusion of the Central Plains War, the 9 brigades that entered the pass, along with their attachments (3 cavalry brigades and artillery, engineers, etc.), were stationed in the Pingjin area. In July 1931, to suppress the anti-Chiang and anti-Zhang war led by Shi Yousan, an additional 3 infantry brigades and 2 artillery regiments from Northeast China, totaling 80,000 men, were transferred into the pass. After the conclusion of the Central Plains War, the 9 brigades that entered the pass, along with their attachments (3 cavalry brigades and artillery, engineers, etc.), were stationed in the Pingjin area. In July 1931, to suppress the anti-Chiang and anti-Zhang war led by Shi Yousan, an additional 3 infantry brigades and 2 artillery regiments from Northeast China, totaling 80,000 men, were transferred into the pass. Along with He Zhuguo's brigade stationed at Shanhaiguan, the elite infantry and most of the artillery of the Northeast Army were distributed in the Pingjin area and Hebei, Chahar region. The 12 infantry brigades, 3 cavalry brigades, and provincial defense brigades remaining in Northeast China were equipped less adequately than the troops inside the pass. Due to the Northeast military and political authorities' longstanding anti-Soviet stance, especially after the 1929 Middle East Railway incident, the deployment of forces was primarily aimed at countering the Soviet Union. The 12 infantry brigades, 3 cavalry brigades, and provincial defense brigades remaining in Northeast China were equipped less adequately than the troops inside the pass. Due to the Northeast military and political authorities' longstanding anti-Soviet stance, especially after the 1929 Middle East Railway incident, the deployment of forces was primarily aimed at countering the Soviet Union. On the eve of the September 18 Incident, there were 165,000 regular troops and 40,000 irregular troops in Northeast China, totaling approximately 200,000 personnel.

Artillery Division No. 10, Mu Chunchang's unit, stationed in Changchun

Heilongjiang Garrison

Xing'an Tunkeng Army Camp, Chonggu Division, stationed in Suolun

Cavalry Brigade No. 3, commanded by Zhang Shusen, stationed in Tongliao

The 9th Independent Artillery Regiment, led by Park Byeong-san, stationed in Taian Town

Jilin Garrison

Liaoning Garrison

The 21st Independent Brigade, led by Zhao Zhixiang (succeeded by Zhang Zhibang), stationed in Ning'an

Zhao Weixiang's unit of the Forest Guard, stationed in Yanshou

Security Brigade, Dou Lianfang Department, stationed in Qiqihar

Cavalry Brigade No. 4, commanded by Chang Yaochen, stationed in Nong'an

Provincial Defense No. 2 hetushu.comcom Travel King Shaonan, stationed in Jiaohe

Independent Cavalry Brigade No. 2, stationed in Manzhouli

The 26th Independent Brigade of the Xing Zhanqing Division, stationed in Harbin

The 7th Independent Brigade, Wang Yizhe Division, stationed in Shenyang

28th Independent Brigade, Ding Chao Unit, stationed in Harbin

The Provincial Defense First Brigade is stationed in Zhishan County, Shancheng Town

The 24th Independent Brigade, Li Du Division, stationed in Yilan

The Northeast Air Force, Navy, and Gendarmerie Command are all stationed in Shenyang

The 2nd Brigade of the Provincial Cavalry, commanded by Wu Songlin, is stationed in Keshan and Baiquan

2nd Brigade of the Provincial Defense Infantry, Su Bing, stationed in Hailar

The 25th Independent Brigade, led by Zhang Zuozhou, stationed in Jilin

The 22nd Independent Brigade of the Soviet-German Army, stationed in Shuangcheng

Border Defense Army Public Security Guard Regiment, Feng Zhanhai's Unit, stationed in Jilin

Zhang Haipeng's unit of the 2nd Provincial Defense Brigade, stationed in Taonan

Border Defense Army Public Security Guard Regiment, Xu Baozhen's Unit, stationed in Qiqihar

The specific location is

Harbin Special District Public Security Team, Wang Zhiyou Department, stationed in Jilin

The 23rd Independent Brigade, led by Li Guilin, stationed in Changchun

Logistics Training Team, Niu Yuanfeng Unit, stationed at Gou Bangzi

The 1st Brigade of the Provincial Defense Infantry, led by Zhang Dianjiu, is stationed in Lantun