en_tn/2ch/34/07.md

He broke down the altars, beat ... cut apart

Josiah would have commanded his workers to do these things. AT: "He commanded his workers to break down the altars, to beat ... to cut apart" (See: rc://en/ta/man/translate/figs-metonymy)

into powder

"into dust." This means to smash them until they have become powder.