Genesis 13 - 15

Abram returned to Canaan from Egypt a richer man. He was still carrying around his extra familial baggage, however, in the form of his Nephew, Lot, who had also acquired a family and great herds of livestock. Abram went back to the place where he had first built an altar to God and communed with Him there. I think God may have reiterated to Abram the need to separate from his extended family there, because he then went back to Lot and suggested they part ways. To which Lot agreed, saying he would go east, where he could see lush pastures for his herds.
After Lot departed, God again made a covenant with Abram concerning the land and his descendants. God told him to go scope out the land as far as he could see in any direction, because He was giving him the title deed to it. So Abram became a nomad, living in a tent and moving around from place to place. He believed God.
But Lot wasn't through causing trouble for Uncle Abraham. He foolishly moved into Sodom, where the people were wicked and weak. Still, the five kings of Sodom and Gomorrah challenged four kings of neighboring lands, and were forced to flee. So the four conquering kings carried off all the remaining inhabitants and possessions of Sodom and Gomorrah, including Abram's nephew, Lot. A captive managed to escape and reported to Abram his nephew had been taken in the raid.
Abram had 318 men who had been trained as fighters in his tribe by that time, so he mustered them all and went after the four kings who captured Lot. A brilliant warrior himself, Abram divided his men and attacked at night. He routed the four kings and recovered all the captives and their possessions.
In Chapter 14, there is a very obscure event that has puzzled Bible scholars down through the ages. First it says Abram was met by the King of Sodom in the King's Valley. The next verse says he met Melchizedek, king of Salem and priest of God Most High, who brought out bread and wine. He blessed Abram and Abram gave a tithe to Melchizedek, a tenth of all he had acquired. This is the first tithe recorded in the Bible, and the mystery of Melchizedek abounds. Who was this priest? I think it was an incarnation of Jesus. The bread and wine certainly signals this may be the case, along with the tithe offered by Abram as He communed with this King.
Then the king of Sodom informed Abram he didn't have to share the spoils of the war with him; he just wanted the people of his kingdom returned, but righteous Abram would have none of the loot. He didn't want that wicked king to be able to say he made Abram rich.
Chapter 15 concerns itself with the Abrahamic covenant. Abram was confused and concerned because God had promised him several times that he would have many descendants, but no son was forthcoming and he was getting old. God now seals that promise and also the promise that the land from Egypt all the way up to the Euphrates River would be his inheritance. Abram's part in the covenant was to sacrifice some young animals and birds. Abram was tired after this work and he fell into a deep sleep. God spoke to him in his sleep and fortold of the captivity of Abram's descendants in Egypt and how they would be freed from it.