וַיִּלָּ֣חֶם יוֹאָ֔ב בְּרַבַּ֖ת בְּנֵ֣י עַמּ֑וֹן וַיִּלְכֹּ֖ד אֶת־עִ֥יר הַמְּלוּכָֽה׃
Now Joab fought against Rabbah of the children of Ammon, and took the royal city.
Read halakhic rulings (Jewish law) on II Samuel 12:26: and classical halakhic sources.