ATTER many months of relative calm in Viet Nam, the Communists had put the fight back into their "fight and negotiate" formula. All week, Communist rockets and mortars rained down, hitting more than 200 cities, towns and military installations from the Demilitarized Zone to the Delta. Yet Hanoi's post-Tet 1969 offensive was initially hardly comparable to last year's campaign in scope, scale and success. This time the allies knew that an attack was coming almost to the hour, and were prepared.
The Communists, at least in the opening phase last week, refused to challenge allied forces in any massive ground engagements, though...