Republic of Korea Army (ROK) began to withdraw through the valley, the PVA infiltrated the brigade position under the cover of darkness, and assaulted the 3 RAR on Hill 504 during the evening and into the following day. Five companies of the US and UK forces attached to 27th Brigade fled the battlefield without orders, expecting an imminent PVA breakthrough at the Kapyong Valley.

Although heavily outnumbered, the 3 RAR and U.S. tanks held their positions into the afternoon of April 24 before