Guerrilla activity increased, with the most tragic single incident taking place during the night of 3-4 September. That night about fifteen guerrillas, including one woman, attacked a radio relay station near Ch'angwŏn, only four miles from Masan. They surprised a group of seven Americans and two South Koreans inside a tent on a hilltop. The guerrillas tied up the Americans, took documents from files, gathered up all weapons, and then the woman shot every one of the prisoners with a tommy gun. Two wounded Americans lived to tell the story. [24-54]
Even in Masan, General Kean faced a dangerous situation. The town was a nest of Communist sympathizers and agents. At the peak of the enemy offensive, Han Gum Jo, manager of the Masan branch of the Korean Press Association, confessed that he was chief of the South Korean Labor Party in Masan and that he funneled information to the enemy through a Pusan headquarters. The chief of guards of the Masan prison was the head of a Communist cell and seven of his guards were members. This and other counterintelligence information came to light at a time when desperate fighting was in progress only a few miles away. General Kean considered the situation so menacing that he ordered Masan evacuated of all people except the police, public officials, railroad and utility workers, and necessary laborers and their families. Evacuation was to be completed in five days.