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The offensive overwhelmed UN forces, allowing the PVA and KPA to capture Seoul for the second time on 4 January 1951.
Neil made his first flight in a jet, a Grumman F9F Panther, on January 5, 1951.
On January 13, 1951, Giáp moved the 308th and 312th Divisions, made up of over 20,000 men, to attack Vĩnh Yên, 20 miles (32 km) northwest of Hanoi, which was manned by the 6,000-strong 9th Foreign Legion Brigade.
By January 16, the Battle of Vĩnh Yên ended as Giáp was forced to withdraw, with over 6,000 of his troops killed, 8,000 wounded and 500 captured.
In late January, upon finding that the PVA had abandoned their battle lines, General Ridgway ordered a reconnaissance-in-force, which became Operation Thunderbolt (25 January 1951).
USS Windham Bay delivered Grumman F8F Bearcat fighter aircraft to Saigon on January 26, 1951.