FOR more than a month, U.S. intelligence agencies have been persistently reporting that the North Vietnamese were sending masses of troops and weapons down the Ho Chi Minh Trail toward South Viet Nam. U.S. officials estimated that since Jan. 1, the Communists had moved some 40,000 men plus 300 tanks, 150 heavy artillery pieces, 160 antiaircraft guns and 300 trucks down the trail. The only important change from pre-cease-fire days, in fact, seemed to be that the North Vietnamese were driving southward in broad daylight, since they were no longer fearful of...
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