The target on March 10, 1967, was the iron- and steelworks at Thai Nguyen in the Red River delta, 35 miles north of Hanoi. The Joint Chiefs of Staff listed it as their top industrial target in North Vietnam, but, because of constraints imposed by Washington on conduct of the Vietnam War, it had been off limits to air strikes until now. The plant was located near the small town of Thai Nguyen. It was part of a sprawling industrial complex that occupied about two square miles. Earlier in the year, US aircraft had bombed the railroad marshaling yard and supply depot at Thai Nguyen, but the main industrial complex was left untouched.
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