In the left-central portion of the Marine sector, the enemy held the dominating terrain. This was particularly true of the rugged area just west of Hill 812, where the opposing trenches were only 50 to 150 yards apart. There a fire-raked landmark, known to the Marines as Luke the Gook’s Castle, had been made into a strong point by the enemy. Its base was a maze of trenches and bunkers, and the 20-foot granite knob could have been taken only at an excessive cost in casualties. Although this bastion was hit repeatedly by almost every type of supporting ordnance, it was never completely destroyed nor denied to the enemy. Operations of trench warfare had inevitably shaken down into a daily routine of sniping by day and patrols or raids by night. Marine artillery, mortars, and stationary tank fire, occasionally reinforced by naval guns, played an increasingly important part in the coordinated destruction of NKPA defenses. As a result the enemy was limited for the most part to well camouflaged reverse slope positions. Because of the 1st Marine Division’s defensive mission and the constant rotation of the more experienced personnel back to the United States, it was considered that men assigned to infantry elements, in particular, needed additional training in small unit leadership and offensive tactics. Consequently the regiments were rotated at monthly intervals to the reserve area near Wontong-ni, where Camp Tripoli had been established for training. An average of 84 NCOs a week completed a 168-hour special course of instruction over a four-week period. The program for the rank and file was so intensive, according to one report, that “it was considered a relief by some Marines to cease training and return to the relatively quiet life on the front lines.”[344] [344] _PacFlt Interim Rpt_ No. 4, IX, 9–11. The truce talks at Panmunjom continued to influence operations at the front. A demilitarized zone having been proposed in anticipation of an armistice, preparations were begun by the 1st Marine Division to develop the defenses along Line ICELAND, generally conforming to the Line KANSAS of Marine fights early in September. It was to be used as a new line of defense if the UN and Communist delegates reached an agreement. Perhaps because other offensive tactics were so curtailed, psychological warfare had its heyday in the winter months of 1952. Propaganda leaflets were dropped from planes or fired by 105mm howitzers. At vantage points along the front, loud speakers bombarded the Communists with surrender appeals in their own language. The effects could not be evaluated with any degree of certainty, but it was hoped that the enemy did not respond with the amused indifference shown by the Marines toward Red propaganda. _Boot, Combat, Rubber, Insulated_