This word introduces background information about the valley of Siddim. Your language may have another way of introducing background information. (See: [[rc://en/ta/man/translate/writing-background]])
Here the kings represent themselves and their armies. Alternate translation: the kings of Sodom and Gomorrah and their armies" (See: [[rc://en/ta/man/translate/figs-synecdoche]])
Possible meanings are 1) some of their soldiers fell in the tar pits or 2) the kings themselves fell in the tar pits. Since [Genesis 14:17](../14/17.md) says that the king of Sodom went to meet Abram, the first meaning is more likely correct. (See: [[rc://en/ta/man/translate/figs-metonymy]])