siege. inside are the vietcong terror squads that charged in during the night. >> the tet offensive was an enormous game changer. they were shooting up the american embassy. they had hit dozens of cities all over vietnam. it was a tremendous shock. >> we have known for several months now that the communist planned a massive, winter-spring offensive. we do not think that our military operations are going to be at all materially affected. >> he was unable to be honest with the american people, because, of course, he was unwilling to simply say, this is an unwinnable war. >> cronkite's vietnam report, reel one, take four. >> these ruins are in saigon, capital of the largest city of