 With the new orders on November 28 , the US 5th Cavalry Regiment of the 1st Cavalry Division left Kunu @-@ ri to rejoin the division to the northeast of Sunchon . With the US 5th Cavalry Regiment absent and the 8th Cavalry Regiment still recovering from the earlier losses from the battle at Unsan , Major General Hobart Gay of the US 1st Cavalry Division placed the US 7th Cavalry Regiment to the south of Pukchang @-@ ni , behind the remnants of the ROK 6th Infantry Division . Lacking reinforcements , the ROK 6th Infantry Division was quickly routed by the PVA 42nd Corps on the night of November 28 . Chinese forces then attacked the 7th Cavalry Regiment under the cover of the fleeing Korean soldiers and refugees pouring into the American front . Under Gay 's order , the 7th Cavalry Regiment withdrew southwest to the town of Sinchang @-@ ni on the morning of November 29 , and the Chinese resumed the drive southward . A fierce battle between the PVA 125th Division and the 7th Cavalry Regiment broke out during the night of November 29 , but by the morning of November 30 the PVA 42nd Corps ' advance was halted . 
