en_tn/1ki/12/21.md

the house of Judah

This refers to the people from the tribe of Judah. (See: rc://en/ta/man/translate/figs-metonymy)

180,000 chosen men who were soldiers

AT: "180,000 carefully selected soldiers" or "180,000 of the best soldiers"

the house of Israel

This refers to the people from the 10 northern tribes.