Genesis 14:13-14

13At that time, Abram, the Hebrew man, was living near the special oak trees of Mamre. Mamre was an Amorite. He was the brother of Eshcol and Aner. These men had agreed to be Abram's friends. A man ran away from Sodom. He told Abram everything that had happened.

14Abram understood that the kings had caught his nephew. So he called 318 men to come together. These men had been born in Abram's camp and they knew how to fight. Abram took his men with him. They went to attack the men who had caught Lot. They went as far as Dan.