On the morning of September 1 the 1st and 2nd Regiments of the KPA 9th Division, in their first offensive of the war, stood only a few miles short of Yongsan after a successful river crossing and penetration of the US line.
The 3rd Regiment had been left at Inch'on, but division commander Major General Pak Kyo Sam felt the chances of capturing Yongsan were strong.

On the morning of September 1, with only the shattered remnants of E Company at hand, the US 9th Infantry Regiment, 2nd Infantry Division had virtually no troops to defend Yongsan.
Keiser in this emergency attached the 2nd Engineer Combat Battalion to the regiment.
The US 72nd Tank Battalion and the 2nd Division Reconnaissance Company also were assigned positions close to Yongsan.
The regimental commander planned to place the engineers on the chain of low hills that arched around Yongsan on the northwest.

A Company, 2nd Engineer Combat Battalion, moved to the south side of the Yongsan-Naktong River road; D Company of the 2nd Engineer Battalion was on the north side of the road.
Approximately 2 miles (3.2 km) west of Yongsan an estimated 300 KPA troops engaged A Company in a fire fight.
M19 Gun Motor Carriages of the 82nd AAA Battalion supported the engineers in this action, which lasted several hours.
Meanwhile, with the approval of General Bradley, D Company moved to the hill immediately south of and overlooking Yongsan.
A platoon of infantry went into position behind it.
A Company was now ordered to fall back to the southeast edge of Yongsan on the left flank of D Company.
There, A Company went into position along the road; on its left was C Company of the Engineer battalion, and beyond C Company was the 2nd Division Reconnaissance Company.
The hill occupied by D Company was in reality the western tip of a large mountain mass that lay southeast of the town.
The road to Miryang came south out of Yongsan, bent around the western tip of this mountain, and then ran eastward along its southern base.
In its position, D Company not only commanded the town but also its exit, the road to Miryang.

The KPA had also approached Yongsan from the south.
The US 2nd Division Reconnaissance Company and tanks of the 72nd Tank Battalion opposed them in a sharp fight.
In this action, Sergeant First Class Charles W. Turner of the Reconnaissance Company particularly distinguished himself.
He mounted a tank, operated its exposed turret machine gun, and directed tank fire which reportedly destroyed seven KPA machine guns.
Turner and this tank came under heavy KPA fire which shot away the tank's periscope and antennae and scored more than 50 hits on it.
Turner, although wounded, remained on the tank until he was killed.
That night KPA soldiers crossed the low ground around Yongsan and entered the town from the south.

At 09:35 September 2, while the KPA were attempting to destroy the engineer troops at the southern edge of Yongsan and clear the road to Miryang, Walker spoke by telephone with Major General Doyle O. Hickey, Deputy Chief of Staff, Far East Command in Tokyo.
He described the situation around the Perimeter and said the most serious threat was along the boundary between the US 2nd and 25th Infantry Divisions.
 He described the location of his reserve forces and his plans for using them.
He said he had started the 1st Provisional Marine Brigade toward Yongsan but had not yet released them for commitment there and he wanted to be sure that UN commander General of the Army Douglas MacArthur approved his use of them, since he knew that this would interfere with other plans of the Far East Command.
Walker said he did not think he could restore the 2nd Division lines without using them.
Hickey replied that MacArthur had the day before approved the use of the Marines if and when Walker considered it necessary.
A few hours after this conversation Walker, at 13:15, attached the 1st Provisional Marine Brigade to the US 2nd Division and ordered a co-ordinated attack by all available elements of the division and the Marines, with the mission of destroying the KPA east of the Naktong Riv
On the morning of September 1 the 1st and 2nd Regiments of the KPA 9th Division, in their first offensive of the war, stood only a few miles short of Yongsan after a successful river crossing and penetration of the US line. The 3rd Regiment had been left at Inch'on, but division commander Major General Pak Kyo Sam felt the chances of capturing Yongsan were strong.
On the morning of September 1, with only the shattered remnants of E Company at hand, the US 9th Infantry Regiment, 2nd Infantry Division had virtually no troops to defend Yongsan. Keiser in this emergency attached the 2nd Engineer Combat Battalion to the regiment. The US 72nd Tank Battalion and the 2nd Division Reconnaissance Company also were assigned positions close to Yongsan. The regimental commander planned to place the engineers on the chain of low hills that arched around Yongsan on the northwest.
A Company, 2nd Engineer Combat Battalion, moved to the south side of the Yongsan-Naktong River road; D Company of the 2nd Engineer Battalion was on the north side of the road. Approximately 2 miles (3.2 km) west of Yongsan an estimated 300 KPA troops engaged A Company in a fire fight. M19 Gun Motor Carriages of the 82nd AAA Battalion supported the engineers in this action, which lasted several hours. Meanwhile, with the approval of General Bradley, D Company moved to the hill immediately south of and overlooking Yongsan. A platoon of infantry went into position behind it. A Company was now ordered to fall back to the southeast edge of Yongsan on the left flank of D Company. There, A Company went into position along the road; on its left was C Company of the Engineer battalion, and beyond C Company was the 2nd Division Reconnaissance Company. The hill occupied by D Company was in reality the western tip of a large mountain mass that lay southeast of the town. The road to Miryang came south out of Yongsan, bent around the western tip of this mountain, and then ran eastward along its southern base. In its position, D Company not only commanded the town but also its exit, the road to Miryang.
The KPA had also approached Yongsan from the south. The US 2nd Division Reconnaissance Company and tanks of the 72nd Tank Battalion opposed them in a sharp fight. In this action, Sergeant First Class Charles W. Turner of the Reconnaissance Company particularly distinguished himself. He mounted a tank, operated its exposed turret machine gun, and directed tank fire which reportedly destroyed seven KPA machine guns. Turner and this tank came under heavy KPA fire which shot away the tank's periscope and antennae and scored more than 50 hits on it. Turner, although wounded, remained on the tank until he was killed. That night KPA soldiers crossed the low ground around Yongsan and entered the town from the south.
At 09:35 September 2, while the KPA were attempting to destroy the engineer troops at the southern edge of Yongsan and clear the road to Miryang, Walker spoke by telephone with Major General Doyle O. Hickey, Deputy Chief of Staff, Far East Command in Tokyo. He described the situation around the Perimeter and said the most serious threat was along the boundary between the US 2nd and 25th Infantry Divisions.  He described the location of his reserve forces and his plans for using them. He said he had started the 1st Provisional Marine Brigade toward Yongsan but had not yet released them for commitment there and he wanted to be sure that UN commander General of the Army Douglas MacArthur approved his use of them, since he knew that this would interfere with other plans of the Far East Command. Walker said he did not think he could restore the 2nd Division lines without using them. Hickey replied that MacArthur had the day before approved the use of the Marines if and when Walker considered it necessary. A few hours after this conversation Walker, at 13:15, attached the 1st Provisional Marine Brigade to the US 2nd Division and ordered a co-ordinated attack by all available elements of the division and the Marines, with the mission of destroying the KPA east of the Naktong Riv
Second Battle of Naktong Bulge