LXX Deut 20:20

ἀλλὰ ξύλον ὃ ἐπίστασαι ὅτι οὐ καρπόβρωτόν ἐστιν, τοῦτο ὀλεθρεύσεις καὶ ἐκκόψεις καὶ οἰκοδομήσεις χαράκωσιν ἐπὶ τὴν πόλιν ἥτις ποιεῖ πρὸς σὲ τὸν πόλεμον, ἕως ἂν παραδοθῇ.

But you may destroy the trees that you know do not produce fruit. Use them to build siege works against the city that is waging war against you, until it falls.