U.S. soldiers of the 223rd Infantry Regiment Counter Fire Platoon run through dense undergrowth looking for a place to locate the sound recording equipment in Korea, during the Korean War. They cross a road and run uphill carrying heavy equipment. Soldiers reach the hill top and take out the equipment from boxes. Soldiers open the bags and boxes. They set up the sound locators on the side of the hill. Brown sets up the microphones in a pattern called an array on ground higher than the surrounding hills. Military vehicles on the road below. Soldiers fix equipment and smoke. Gun and artillery fire sound. A soldier records the artillery fire sound while another one records the sound as a visual image. Another soldier computes the direction line and radios the information to the counter fire headquarters. 'Counter Fire Plt' sign board outside tents. The plotter plots down the information on a boards and draws the direction line on a map. He pin points the enemy gun and draws it on a chart. He then calls the artillery fire direction center. A soldier receives the message. An intelligence officer checks the information and the order is sent to the artillery battery. Soldiers amidst barricades. They load HE fire charges and fire a 105 Howitzer. Many artillery guns fired. A soldier watches through binoculars.

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