Complete the following sentence: Operation Pollux was a military operation during the First Indochina War by the French forces in northwest Vietnam in November and December 1953 was one of a twin operation, the other being Operation Castor. Operation Pollux was a military operation during the First Indochina War by the French forces in northwest Vietnam in November and December 1953. <unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk> Operation Castor<unk> re-captured and then established a fortified airfield in Điện Biên Phu, in the north-west corner of Vietnam.<unk> Operation Castor<unk> recaptured and then established a fortified airfield in Điện Biên Phu, in the north-west corner of Vietnam.<unk> Operation Castor<unk> recaptured and then established a fortified airfield in Điện Biên Phu, in the north-west corner of Vietnam. Pollux<unk> Operation Pollux<unk> was the name of the second operation (the evacuation of Lai Châu to Dien Bien Phu), which took place weeks later. <unk> <unk> <unk> <unk> <unk> <unk>
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