 <unk> in 1949 , the regiment trained for more than a year before the outbreak of the war on June 25 , 1950 . On that day , half of the regiment led North Korean forces against South Korean troops by land and sea , pushing them back after several days of fighting . Over the next six weeks the regiment advanced slowly down the Korean Peninsula , acting as a forward unit of the North Korean army . Suffering from a lack of supplies and mounting casualties , the regiment was committed to the Battle of Pusan Perimeter as part of a push to force United Nations ( UN ) troops out of Korea . 
