Joel 2:4 Midrash

כְּמַרְאֵ֥ה סוּסִ֖ים מַרְאֵ֑הוּ וּכְפָרָשִׁ֖ים כֵּ֥ן יְרוּצֽוּן׃

The appearance of them is as the appearance of horses; And as horsemen, so do they run.

Read midrashic interpretation of Joel 2:4: and classical rabbinic exegesis.