Genesis 14:10

10. Full of slimepits Sept . , φρεατα ασφαλτου , pits of asphaltum; Vulg . , puteos multos bituminis, many pits of bitumen . The Hebrew may be rendered: The vale of Siddim was pits, pits of mineral pitch; that is, such bituminous pits abounded there; and this abundance of asphalt has given the Dead Sea the name Asphaltic Lake . These pits served as so many snares to the kings of Sodom and Gomorrah, who, with their forces, were defeated, and fled, and fell there. These two kings seem to have taken the lead in the battle, and so are mentioned as representing all the rest . From Genesis 14:17; Genesis 14:21 we infer that the king of Sodom himself escaped capture, probably by fleeing to the mountains .

They that remained That is, those who were neither killed in battle nor taken prisoners .