A series of battles, including Twin Tunnels, the Battle of Chipyong-ni, and the Battle of Wonju between January and February 1951 marked a turning point in many ways for the entire Korea War. Importantly, these battles (especially Chipyong-ni on February 13–14, 1951) shaped the tactics that would replay throughout both Korea and Vietnam whereby well equipped isolated firebases, in communication by air and radio with regional divisional forces, held out against numerically superior light infantry formations. Eventually such tactics turned around the UN's disastrous retreat from the north into a stalemate that lead to an Armistice two years later relatively close to the site of these important battles.
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http://www.cgsc.edu/carl/docrepository/1korstfride_km.pdf