During Cold War, refugees from East Germany in camp in Giessen, West Germany, building fence

CU hands of man in uniform holding letter / CU same man opening letter, then turning it over / CU man's feet as he walks along / refugee drives tractor digging trench next to wire fence being built in forest / indistinct shot / refugee driving tractor digging trench, pan along trench behind tractor already dug / WS refugees digging in trench / man's feet walking along ground / WS refugees building fence / shot through windshield of car as it drives along road and stops at fence / road sign saying "Zone Limit"/ road sign next to road saying "Zone Boundary 165 yds, No road" / CU sign in German and English saying in English "Brit Zone"/ Note: exact day not known