On March 9, 1938, on the third day of the siege of Lan County by the main force of the 359th Brigade of the 120th Division, the troops of the 359th Brigade made decisive progress under the command of Division Commander He.

The Japanese troops in Qilan County were in a precarious situation, they could no longer hold the county, and the Japanese troops began to prepare for evacuation.

The 1st Reserve Regiment, which had been fighting fiercely with the Japanese 119th Wing for two days, had withdrawn to Lanxian, and the troops began to set up defensive positions in Lanxian.

Sun Weiguo was determined to reserve the 1st Regiment, the 1st Independent Regiment of the Jinsui Army, and the 3rd Cavalry Regiment to rely on the favorable terrain of Lanxian County to fight a decisive battle with the Japanese troops.

On the same day, the 1st Reserve Regiment sent a telegram to the whole country, and the regiment commander Sun Weiguo issued a telegram that the 1st Reserve Regiment would coexist with Lan County and swear to fight to the death with the Japanese invaders, and Sun Weiguo reported the great victory achieved in Loufan County, and announced the capture of Ishida Jinzo, the captain of the 119th Wing of the Japanese Army.

After Sun Weiguo issued a telegram, the headquarters of the Eighth Route Army sent personnel to escort Ishida Jinzang to the headquarters of the Eighth Route Army, and at the same time, Deputy Commander-in-Chief Peng of the Headquarters and Deputy Chief of Staff of the Left jointly sent a telegram to commend the troops of the First Regiment of Reserve.

The operation in the northwest of Jin Province had a crucial impact on the morale of the whole army and the people, and the Japanese Central China Dispatch Army and the North China Front Army jointly opened up the Jinpu Line, and they fought fierce battles with the troops of the Fifth Theater of Operations.

You must know that from the beginning of the war to the present, the Chinese troops have never captured the captain of the Japanese army, and there is no precedent for a regiment to defeat an infantry wing, but now this case has happened, and the devil soldiers have been hit by it, and they feel that the Chinese troops have become stronger.

When the Chinese troops got the news, the officers and men of the troops were encouraged, and they fought bravely to kill the enemy, hoping to achieve the same results as the 1st Reserve Regiment.

This incident gave great encouragement to the Chinese troops, and the chairman of the Military Commission personally sent a telegram to the Second Theater to inquire about it.

In order to boost the morale of the troops, Chairman Chiang asked Yan Xishan of the Second Theater to create favorable conditions for Sun Weiguo's decisive battle with the Japanese army.

In any case, now the Japanese army is the enemy of the whole Chinese army, and in order to fight the Japanese army, everyone must let go of their previous grievances.

At 10 a.m. on March 9, the day after Sun Weiguo arrived in Lan County.

After receiving the reply from the cavalry corps, the commander's department appointed Sun Weiguo, colonel of the first reserve regiment, as the commander of Lanxian County's urban defense, and commanded the first reserve regiment, the first independent regiment, the third cavalry regiment, the sixth cavalry regiment, and the eighth artillery battalion.

Among them, the 6th Cavalry Regiment and the 8th Artillery Battalion were newly dispatched to Lanxian by the Commander's Department, and Chairman Chiang hoped that Sun Weiguo's Reserve 1st Regiment would be able to defeat or even completely annihilate the 119th Wing of the Japanese Army in Lanxian, so as to boost the morale of the Chinese troops participating in the operation on the Jinpu Line.

In addition to the 6th Cavalry Regiment and the 8th Artillery Battalion, Yan Xishan also sent an independent brigade to fight in Lanxian County.

However, this independent brigade unit is currently some distance away from Lan County, and they cannot go to Lan County to fight for the time being.

At one o'clock in the afternoon, the 119th Wing began to set off from Loufan County, and the three infantry battalions under the 119th Wing had a total of seven infantry squadrons and two machine gun squadrons, and a mountain artillery brigade under the leadership of the acting wing commander of the 119th Wing, Miura Shirou, quickly went to Lan County.

At the same time, the Koizumi Brigade and the Fujiwara Brigade had a total of four infantry squadrons, two machine gun squadrons, and a cavalry wing that made a detour from the right side to attack the defenders of Arashi County from the flank, while the chief of staff of the 109th Division, Shizaburo Ochiai, led the newly reinforced 69th Wing, the Kimura Brigade and the Field Artillery Brigade, to hold back.

Sun Weiguo's conditions were being discussed by the Japanese military leadership, but the commander of the 109th Division, Yamaoka Shigema, gave an order to Shizaburo Ochiai, and he asked Shizaburo Ochiai to defeat the defenders of Arashi County and do his best to capture the flag of the 119th Wing.

Receiving orders from Yamaoka Shigetsu, Shizaburo Ochiai began to order his troops to advance and launched an attack on the defenders of Arashi Prefecture.

At half past one in the afternoon, the 8th Battalion of the 6th Cavalry Regiment Covered Artillery joined the battle sequence of the defenders of Lanxian County and accepted the command of Sun Weiguo.

With the 6th Cavalry Regiment and the 8th Artillery Battalion joining the battlefield, Sun Weiguo had more sufficient troops, before Sun Weiguo planned to defeat the Japanese troops and strive for the total annihilation of the Japanese troops, but with the arrival of reinforcements, Sun Weiguo issued a combat goal of completely annihilating the Japanese troops.

After a conversation with Commander Zhao of the Sixth Cavalry Regiment, Sun Weiguo appointed Commander Zhao as the commander of the cavalry, and commanded the Third Cavalry Regiment, the Sixth Cavalry Regiment, and the reconnaissance company of the First Reserve Regiment.

The 8th Artillery Battalion, the 1st Independent Regiment Artillery Company, and the 1st Reserve Regiment Artillery Company set up artillery positions on the high ground near the regimental headquarters of the 1st Reserve Regiment, and the artillery battle group was under the direct command of Sun Weiguo.

"Regiment Commander, after Lanxian is reinforced, we can have a decisive battle with the Japanese army under the walls of Lanxian. The first-line troops commanded by Fu Tao blocked the Japanese crossing, and then I transferred the artillery positions and regimental headquarters to the city, and the first-line troops intercepted the Japanese troops layer by layer, attracting the Japanese troops to the city, and then the first-line troops quickly detoured back to the south bank of our Lan River to set up positions, and the artillery group and the first independent regiment defended the Japanese troops, and the cavalry troops fought out from the flanks and defeated the Japanese troops. ”

Chief of Staff Zhao Lerong immediately came up with a battle plan, and he looked at Sun Weiguo and reported.

Zhao Lerong planned to have a decisive battle with the Japanese troops under the city, so as to defeat the Japanese troops, block the Japanese troops and prevent them from escaping, so as to annihilate them completely, and this plan required the regimental headquarters and artillery positions set up outside the city to be transferred.

Fu Tao commanded the front-line troops to hold the position on the north bank, and took advantage of the Japanese army crossing the river to attack half-crossing, and the first independent regiment quickly launched an attack from the flank, and the two regiments could completely annihilate the Japanese troops in the Lanhe River, and the cavalry troops searched nearby to kill the Japanese troops who fled from the army."

Political commissar Shen Wei also came to Sun Weiguo, she looked at the map and put forward different opinions.

Sun Weiguo remained silent, he looked at the map, his face showed a calm expression, but his brain was thinking quickly.

"How many units of the Japanese army are there now, and where have they arrived?" After being silent for a while, Sun Weiguo asked softly.

"At present, the Japanese troops are divided into two routes, one Japanese army is advancing from the front, and they can reach the Arashi River before three o'clock in the afternoon, and the other Japanese unit is moving from the flank, and they will cross the Arashi River upstream of the first line of troops." Zhao Lerong immediately made a report.

Sun Weiguo nodded, he looked at Zhao Lerong and said, "Where is the Japanese cavalry wing?" ”

"Japanese cavalry units on the flanks." Zhao Lerong immediately replied.

Knowing that the Japanese cavalry wing was deployed on the flank, Sun Weiguo smiled at the corner of his mouth, and he clenched his right hand into a fist and knocked the map.