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February-March 1971Reputable source · 2 sourcesWell documented

Lam Son 719 and the Limits of Vietnamization

South Vietnamese forces invade Laos alone, and a North Vietnamese ambush turns their withdrawal into a rout.

On the timeline · around February-March 1971 · Vietnamization and WithdrawalVietnamization and WithdrawalLam Son 719 and the Limits of Vietnamization197019711972

Quick facts

Operation
Lam Son 719
Dates
February-March 1971
Forces
South Vietnamese ground troops, US air support only

What happened

In early February 1971, seeking to interdict North Vietnamese supply lines and test how far Vietnamization had progressed, Nixon ordered a South Vietnamese ground offensive into Laos, codenamed Lam Son 719. US law barred American ground troops from Laos, so South Vietnamese forces crossed the border alone, backed by US air and artillery support from inside South Vietnam. North Vietnamese commanders had anticipated the operation and massed forces to meet it. The South Vietnamese withdrawal disintegrated into a disorderly retreat under heavy pressure, with images of ARVN soldiers clinging to the skids of evacuation helicopters broadcast internationally.

Why it matters

Lam Son 719 was the clearest public test yet of whether South Vietnam's army could fight and win without American troops on the ground, and it failed that test in full view of the press, raising doubts about Vietnamization that would resurface catastrophically during the Easter Offensive the following year.

How we know

The State Department's Office of the Historian describes the operation's planning and its collapse as part of the broader Vietnamization narrative.

Sources

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