וַיַּעַבְר֖וּ אֶת־הַיַּרְדֵּ֑ן וַיַּחֲנ֣וּ בַעֲרוֹעֵ֗ר יְמִ֥ין הָעִ֛יר אֲשֶׁ֛ר בְּתוֹךְ־הַנַּ֥חַל הַגָּ֖ד וְאֶל־יַעְזֵֽר׃
Rashi on II Samuel
[The valley of] Gad unto Yazer. He [Yoav] started with the people of Gad because they were hardened warriors. He reasoned, "If only they fight me and stop me".3From taking this census.