My brother fought with the 1st Marine Division in Hue City. He had just returned from R&R the day before and his company was sent out from Phu Bai to relieve the MacV compound in Hue which was under siege.
They barely made it to the compound and the 2/5 was called in to assist and help clear the area south of the Perfume River. After they were decimated the 1/5 was brought in to clear the north side and the Citidel. The Marines were actually outnumbered by NVA regulars and placed under firepower restrictions early on so not to destroy the city. He rarely talks about it to this day.
I was in Viet Nam a year later but thanks to his council I stayed out of the Infantry and was in transportation. I was lucky enough to visit Hue then. It was called New Hue as it had been rebuilt with US tax dollars. I was only there for an afternoon but heard about the mass graves north of town where thousands of South Vietnamese, murdered by Communist Cadre when they took over the city, were being unearthed.
I was at Camp Pendleton then, scheduled to end my enlistment in July....they were rushing troopies over there left and right, some with as little as three months remaining on their term.