The battle of Chipyong-Ni, fought 13 - 15 February 1951, on the central Korean front by the 23rd Regimental Combat Team (RCT), is considered a classic perimeter defense and is regarded as a pivotal engagement in the Korean War that dealt the Chinese Communist Forces (CCF) their first decisive operational defeat following their intervention in the war. The battle of the Twin Tunnels, fought on 1 February 1951 by the RCT, is frequently overlooked by historians, but is a part of the same combat action or operation that concluded with the successful battle of Chipyong-Ni. Additionally, the battle of the Twin Tunnels was fought under conditions nearly identical to those of the later, larger and more spectacular battle of Chipyong-Ni. While the latter dealt a decisive operational defeat to the CCF; the former dealt a decisive tactical defeat. The Twin Tunnels, then, serves as a preview of the decisive battle of Chipyong-Ni.

Martin W. Andresen, project advisor. "15 April 1988."