Albert Barnes Commentary Zechariah 10:5

"And they shall be as mighty men, treading down [their enemies] in the mire of the streets in the battle; and they shall fight, because Jehovah is with them; and the riders on horses shall be confounded." — Zechariah 10:5 (ASV)

And they - (the house of Judah, of whom he had said, He hath made them as the goodly horse in the battle) shall be as mighty men, trampling on the mire of the streets. Micah had said, she shall be a trampling, as the mire of the streets (Micah 7:10), and David, I did stamp them as the mire of the street (2 Samuel 22:43). Zechariah, by a yet bolder image, pictures those trampled upon, as what they had become, the mire of the streets, as worthless, as foul; as he had said, they shall trample on the sling-stones (Zechariah 9:15).

And they shall fight, because the Lord is with them, not in their own strength, he still reminds them; they shall have power, because God empowers them; strength, because God strengthens them: in presence of which, the goodly war-horse of God, human strength, the riders on horses, shall be ashamed.