You understood what I said. Keeping in mind that as with any military operation whether conventional or guerrilla, the first goal must be victory if at all possible. The VC and NVA would have loved to have been able to take and hold each and every city they attacked during Tet. There's no doubt about that. However, the military facts of life there were such that they were not able to defeat their enemy in large open operations. That is why a guerrilla force existed in the first place.
Even if they had taken every target they attacked, how could they possibly hope to hold them? As I mentioned before, they just didn't have the firepower to do it. The holding of territory is the ultimate definition of victory and this simply was not possible for them. So, not being stupid and realizing this, they tried to use Tet to demoralize the South Vietnamese people and the Americans back home. They gave the impression that they were stronger than they actually were. In so doing and as Giap said "America's resolve was weakening and the possibility of victory could be theirs." Militarily speaking, Tet was a crushing defeat for the VC and the NVA. At the end of the day they held no ground and suffered immense casualties. At least the people in command in N. Vietnam were willing to sacrifice those involved for their long range goals.
Just for something else to chew on, while I was in Vietnam there were peace talks in Paris, this feeling about America was apprently re-enforced for the N. Vietnamese thanks to people like John Kerry. This was in the Boston Globe just yesterday "WASHINGTON -- In a question-and-answer session before a Senate committee in 1971, John F. Kerry, who was a leading antiwar activist at the time, asserted that 200,000 Vietnamese per year were being "murdered by the United States of America" and said he had gone to Paris and "talked with both delegations at the peace talks" and met with communist representatives."
I wonder how many fewer names would be on that wall if it were not for the likes of Mr. Kerry. I truly suspect that the war could have been over before I and my friends had to go there.
In any event, I hope you can see my point about the goal of the Tet offensive.