78:8.5

When these barbarian cavalrymen from the northeast overran the whole Euphrates valley, they did not conquer the remnants of the Andites who dwelt about the mouth of the river on the Persian Gulf. These Sumerians were able to defend themselves because of superior intelligence, better weapons, and their extensive system of military canals, which were an adjunct to their irrigation scheme of interconnecting pools. They were a united people because they had a uniform group religion. They were thus able to maintain their racial and national integrity long after their neighbors to the northwest were broken up into isolated city-states. No one of these city groups was able to overcome the united Sumerians.