Another interpretation: this is Esau, as it is said, "Because the enemy said" (Lamentations, cf. the verse). Rabbi Hanina bar Pappa raised a contradiction: it is written, "the Almighty, we cannot find Him out, great in power" (Job 37:23), and it is written, "Your right hand, O LORD, is glorious in power." There is no difficulty: here it speaks of the time of judgment, there of the time of war.
The Enemy Is Esau and God's Power in War Versus Judgment
Yalkut Shimoni on Torah 246:9
דָּבָר אַחֵר זֶה עֵשָׂו, שֶׁנֶּאֱמַר "יַעַן אָמַר הָאוֹיֵב". רַבִּי חֲנִינָא בַּר פַּפָּא רָמֵי, כְּתִיב (איוב לז, כג) "שַׁדַּי לֹא מְצָאנֻהוּ שַׂגִּיא כֹחַ", וּכְתִיב יְמִינְךָ ה' נֶאְדָּרִי בַּכֹּחַ. לֹא קַשְׁיָא, כָּאן בִּשְׁעַת הַדִּין כַּאן בִּשְׁעַת מִלְחָמָה.