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On the night of 5 August the detachment infiltrated from USS Diachenko (APD-123) with their inflatable boat to conduct a demolition raid against train tracks and a bridge-tunnel near Yosu. LTJG Atcheson and BM3 Warren "Fins" Foley, as the swimmer scouts, swam 200 yards ahead of the boat in swift current, exiting the water at a seawall just below their target. After patrolling up a 35-foot embankment and making a hasty reconnaissance, they signaled the remaining men to come ashore with the explosives. Suddenly 10 North Korean soldiers on a handcar came out of the tunnel and opened fire. Foley was hit and fell over the seawall. LTJG Atcheson threw several hand grenades that dispersed the enemy, and this allowed time for the UDT men to get clear and back to their boat for return to the Diachenko. Foley, who had a smashed kneecap and wounds in his hand and thigh, was the first U.S. Navy casualty of the Korean War.Individual weaponry taken by UDT men behind enemy lines was usually limited to the submachine guns, pistols, and knives found most useful for the close-quarters combat that characterized most raiding missions. Though presumably available, sound suppressors for the weapons are not known to have been used. The men used a variety of demolitions in their work, but the standardMark-135 Demolition Pack, which contained twenty pounds of C-3 plastic explosive was foremost.
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