There are numerous places to find After Action Reports/discussions about the battle and how both sides thought they had won.
The Vietnamese understood the American People would not support a War of Attrition which is the strategy Westmoreland put into place. His Successor, Abrams, changed it to a war of logistics with minimum casualties and made much more progress.
It was not unusual to have 105mm Artillery rounds land within 25-50 meters of an American position when under heavy attack by the NVA. Helicopter gunships also worked their fires into such distances in extreme cases.
More than a few times.....Fire Bases used Beehive and other anti-personnel weapons directly at attacking NVA forces....much like huge shotguns. Such tactics were very effective in stopping an infantry assault when the enemy troops were in the open charging perimeter defenses.
Those kinds of artillery rounds were developed during the war as were Flechette rounds for the helicopter gunship rockets.