The battle continued for quite some time. The two peoples fought for maybe months only to arrive at a stalemate. The two leaders met once again and called a truce. In the end, the joining of these two people made for a stronger society. This may not be too far from the truth.
Myth tells only of that which really happened, which manifested itself completely.
What Eliade means is that myths are a representation of how a people believe the world began. The source of a culture is usually the core of that society. The United States bases its government and values in freedom and the creation of our country is imparted to our Founding Fathers. This illustrates the importance a culture attributes to its beginnings. This status of Gilgamesh can be seen by the many ancient translations of his story, this epic survived for many years and many peoples translated it for their own society.