[US Marines of 1st Division marching down canyon known as Nightmare Alley during the retreat of the Changjin Reservoir after being cut off by Red Chinese forces]

[Two American Marines, faces etched by fatigue, pause during their grim retreat from the Changjin Reservoir after being cut off by the Red Chinese forces]

[American Marine with face etched by fatigue during his outfit's grim retreat from the Changjin Reservoir after being cut off by the Red Chinese during the Korean War]

[US Marines of 1st Division resting after making it through a canyon road known as Nightmare Alley during retreat from the Changjin Reservoir]

Christmas in Korea - Completely exhausted, a Marine sleeps at wheel of his halted jeep while his pet Korean puppy whines in his ear.

Christmas in Korea: Wrecked vehicles block the road. Calmly the troops stripped them of their equipment, shoved them aside and grenaded them.

Some of the Marines on the march down the alley, plodding along with sleeping bags wrapped around them in an attempt to get a little warmer - futile. Everyone walked who wasn't wounded or frozen-footed.

Near the end of the road soldiers look but do not stop as they pass the bodies of men killed in the last Chinese ambush. These dead were picked up later.