In a Midianite's dream, what tumbled into the camp and knocked a tent over?

Answer: A loaf of barley bread

Gideon overheard the dream. The man's friend said it meant "the sword of Gideon," so Gideon worshiped and roused his men.

“And as Gideon arrived, a man was telling his friend about a dream. “Behold, I had a dream,” he said, “and I saw a loaf of barley bread come tumbling into the Midianite camp. It struck the tent so hard that the tent overturned and collapsed.””— Judges 7:13 (BSB)