The US Military the greatest in the world at the time lost to a group of Asians who had small arms little to no armor and very limited artillery.
A rather simplistic view of the Indo China Wars! Communist forces had firepower aplenty; where it counted.
- as the French found out to their cost at a place called Dien Bien Phu (an event which broke French resolve to continue the war).
https://www.youtube.com/watch?v=tG3mifrpGp0
- and when US forces received similar treatment a decade or so later at the Battle of Khe Sanh.
https://www.businessinsider.com/vietnam-war-battle-of-khe-sanh-us-2018-1
While guerrilla fighters played their part in both Indo China Wars, it took more than just a few bare footed peasants running around in the jungle with small arms to achieve final victory. This should come as no surprise to any serious student of military history - the architects of guerrilla warfare, such as Mao Zedong, predicted such a progression of events in a successful Communist insurrection.