(14:8-15) Soon after Lot moved to Sodom, a war broke out between the kings of Sodom and Gomorrah and some of the other local kingdoms. The Sodomites were defeated and Lot was taken prisoner. That's when Abraham got involved. He sent an army of slaves to pursue and smite Lot's captors.

(14:8) "The king of Sodom, and the king of Gomorrah ... joined battle with them [the surrounding kingdoms]."

(4:10) "And the kings of Sodom and Gomorrah fled, and fell there; and they that remained fled to the mountain."

(14:12) "And they took Lot, Abram's brother's son, who dwelt in Sodom."

(14:14-20) Abraham's war to rescue Lot
To free Lot from captivity, Abraham sends an army of slaves to pursue and smite his captors.
God's 2nd killing

(14:14-15) "When Abram heard that his brother [Lot] was taken captive, he armed his trained servants ... three hundred and eighteen, and pursued them into Dan ... and smote them."
Does God approve of slavery?

"Dan" is an obvious anachronism, since the city of Dan was not named "Dan" until the time of the Judges (Judges 18:29). In fact, Dan (for whom the city was named) was not even born yet (Genesis 30:6).
When was the city of Dan named?

(14:16) "And he brought back all the goods, and also brought again his brother Lot."

(14:17) "The king of Sodom went out to meet him after his return from the slaughter."

(14:18) "And Melchizedek king of Salem brought forth bread and wine: and he was the priest of the most high God."
Melchizedek, by the way, had no father or mother, no beginning or end, just like the Son of God. (Hebrews 7:1-3)

(14:19, 22) "The most high God, possessor of heaven and earth"
Who owns the earth?