וַיַּכֵּ֥הוּ יִשְׂרָאֵ֖ל לְפִי־חָ֑רֶב וַיִּירַ֨שׁ אֶת־אַרְצ֜וֹ מֵֽאַרְנֹ֗ן עַד־יַבֹּק֙ עַד־בְּנֵ֣י עַמּ֔וֹן כִּ֣י עַ֔ז גְּב֖וּל בְּנֵ֥י עַמּֽוֹן׃
And Israel smote him with the edge of the sword, and possessed his land from the Arnon unto the Jabbok, even unto the children of Ammon; for the border of the children of Ammon was strong.
Read halakhic rulings (Jewish law) on Numbers 21:24: and classical halakhic sources.