What does Genesis 14:9 mean?

In this passage, four kings of the east, led by Chedorlaomer, king of Elam, have gone to war against the city-states and peoples of the land of Canaan. This is in response to rebellion among these Canaanite tribes. So far, the army has defeated everyone in its path, a southerly line east of the Jordan River all the way to the edge of the southern wilderness. Then, this counter-revolutionary force turns back north to defeat Kadesh and the peoples south of the Dead Sea.

Now the four kings listed in this verse come to the Valley of Siddim to do battle against the five kings of the city-states grouped at the southern end of the Dead Sea. Those five kings include the kings of Sodom and Gomorrah. Apparently, the battle won't last long, since the Bible only describes the aftermath, rather than the battle itself.