Some Early Vietnamese Groups
Sometime after the advent of the societies found at Hoa Binh and Bac Son, another group of people developed a culture at Quynh-van (Nghe-an) where an aspect of their religion was manifested in large mounds of mollusk shells which had been collected from the Red River Delta. Bodies had been buried under these piles of shells in a seated position with bent knees--the same position of many buried bodies found throughout Indonesia and the Philippines. This signifies to archaeologists that these early people had an advanced society based on fishing and that their religion was oriented toward the sea.
At a location further south of the Tonkin Delta, in the central region of Vietnam's coast, remains of another culture have been found at Sa Huynh. This culture existed from about 4000-1000 BC. Tools, ornamental beads, and funerary jars have also been found at these archaeological sites. These jars were usually located at the water's edge and probably signified a dead person's journey out to sea.
Throughout Southeast Asia, the Neolithic Period can be considered the period in which organized societies developed. During this period the Vietnamese people spread across a large area from the foothills of northern Vietnam's western cordillera to the eastern coast. It is thought that they lived in small communities with groups of extended families living in a simple communal way. The growing of rice, their staple food, had developed into two distinct methods--shifting cultivation, done on a dry field, usually in upland areas, and wet rice cultivation, which involved the construction of dikes around rivers that collected water into knee-deep ponds in which the rice was grown. Both methods are still used today.
Shifting Cultivation and Wet Rice Agriculture
Dry rice agriculture involves the cooperation of a small group of people, usually an extended family, which works together to cut down an area of forest. After one to two months the newly cut trees and underbrush have dried and are burned. Shifting cultivators then plant the seeds in the fertile soil-ash mix. In Vietnam the forest is cut down just after the rainy season, and planting takes place at the start of the next rains. Most shifting agriculturalists grow a variety of grains which have different growing periods--maize, for example, takes only a few months to mature while rice may take six to eight months. During this period the fields must be guarded against rats and birds.
Because dry rice agriculture quickly depletes the nutrients in the topsoil, shifting cultivators must move every two to three years to a new area, hence the name shifting cultivation. The same cultivators usually return to a plot of land after about 10 years, when the forest has had the opportunity to grow up again.
Today, shifting cultivation is still practiced by groups in the highlands of Vietnam who avoided Chinese and French colonization and who, in many cases, live close to the way they did hundreds of years ago.
Wet rice agriculture demands a high level of group cooperation, usually involving more than one extended family. Here, rice is grown in paddies, the knee-deep ponds that are edged by dikes. These dikes depend upon a high level of labor and maintenance and since each pond feeds into another, families and small groups must work together to insure that the water flows correctly. In prehistoric times, the people in the Tonkin Delta relied upon the flooding of the Red River and other rivers each year to fill the paddies with fresh water that contained important minerals as well as small aquatic animals which fed nutrients into the ponds. In most places today the water is fed into the paddies by a more elaborate system of irrigation ditches and canals, which control the flooding of the river.
Dong Son Civilization
This brings us to the period of Vietnam's "highest" prehistoric civilization when the inhabitants of the Tonkin Delta reached the Bronze Age. How the people along Vietnam's northern coasts learned the technology of forging bronze is unknown. Many researchers believe it was introduced from China.
The people of Thanh Hoa used bronze to make large ritualistic drums known as the Dong Son drums. The Dong Son people lived from about 800-200 BC and their drums tell about their lives and religious beliefs. Three-dimensional carvings, carvings in bas-relief, and etchings on the drums show people farming, doing daily chores such as pounding rice, walking with spears, building boats and riding in them, and playing trumpet-like instruments. Dong Son drums also portray houses built on bamboo poles or stilts in the same architectural style as they are built today in Vietnam and throughout Southeast Asia. Animals depicted on the drums include frogs, sea birds, and deer. Archaeologists believe that the frogs and sea birds symbolized some of the people's religious beliefs pertaining to the worship of all the natural elements which surrounded them. They gave special attention to the sun and the water (the rain, the river, and the ocean) which could be either beneficial or detrimental to their existence. Another aspect of the Dong Son religion which interests archaeologists is their method of burying the dead. In some cases this involved the building of brick tombs with three separate compartments. Some held gold, some silver, and some iron. Because only a few select individuals were buried in the elaborate tombs, archaeologists and historians believe that the Dong Son society probably developed from small communal groups into a society ruled by an aristocracy or monarchy.
This aristocratic or feudalistic society was one in which a ruling family, or group of families, gained its wealth through the labor of the working people or peasants. The peasants were usually heavily taxed but in return were guaranteed protection by the aristocracy in case of war or natural disaster. While a feudalistic relationship had obvious benefits for the aristocracy, the relationship between the king and his people also had religious overtones. The people generally believed that the system had been established by the gods long before they were born. The king or queen was considered as separate from the ordinary mortals, a medium between the peasants and the spirit world.
As the culture developed in the Tonkin Delta and southward along the coast, the people began to practice the arts of making pottery and weaving cloth. By this time, warfare between tribes, as well as with outsiders, had become more sophisticated. Warfare is depicted on the Dong Son drums by dancing men in feather headdresses holding spears.
Some Dong Son-like drums are still used by the Muong people, a highland group which is found in Vietnam's western cordillera. Others have been unearthed in southern China and Indonesia. Most of the drums made and used around the Red River were probably destroyed when the Chinese filtered into the area around 300 BC and finally imposed colonization on the people of the Tonkin Delta.
http://www.hawaii.edu/cseas/pubs/vietnam/vietnam.html#chapter1