וְעָשָׂ֤ה יְהוָה֙ לָהֶ֔ם כַּאֲשֶׁ֣ר עָשָׂ֗ה לְסִיח֥וֹן וּלְע֛וֹג מַלְכֵ֥י הָאֱמֹרִ֖י וּלְאַרְצָ֑ם אֲשֶׁ֥ר הִשְׁמִ֖יד אֹתָֽם׃
און גאָט װעט טאָן צו זײ אַזױ װי ער האָט געטאָן צו סיחון און צו עוֹג, די מלכים פֿון אֶמוֹרי, און צו זײער לאַנד, װאָס ער האָט זײ פֿאַרטיליקט.
Ibn Ezra
To go to and fro denotes going out to, and returning from, battle. In other words: “Even if I were not now going to die, still I am incapable of waging war. Thus, you have no need of someone who would leave you unattended. But rather, God will destroy the nations, and Joshua also — and the proof is that which you have seen with your very eyes, namely, the war of Siḥon and ‘Og.”