Num 21:23

וְלֹא־נָתַ֨ן סִיחֹ֣ן אֶת־יִשְׂרָאֵל֮ עֲבֹ֣ר בִּגְבֻלוֹ֒ וַיֶּאֱסֹ֨ף סִיחֹ֜ן אֶת־כָּל־עַמּ֗וֹ וַיֵּצֵ֞א לִקְרַ֤את יִשְׂרָאֵל֙ הַמִּדְבָּ֔רָה וַיָּבֹ֖א יָ֑הְצָה וַיִּלָּ֖חֶם בְּיִשְׂרָאֵֽל׃

But Sihon would not let Israel pass through his territory. Instead, he gathered his whole army and went out to confront Israel in the wilderness. When he came to Jahaz, he fought against Israel.