What does 2 Samuel 12:31 mean?

And he brought forth the people that were therein, and put them under saws, and under harrows of iron, and under axes of iron, and made them pass through the brickkiln: and thus did he unto all the cities of the children of Ammon. And David and all the people returned unto Jerusalem.

And he brought forth the people that were therein, and put them under saws, and under harrows of iron, and under axes of iron, and made them pass through the brickkiln: and thus did he unto all the cities of the children of Ammon. So David and all the people returned unto Jerusalem.

And he brought forth the people that were therein, and put them under saws, and under harrows of iron, and under axes of iron, and made them pass through the brickkiln: and thus did he unto all the cities of the children of Ammon. And David and all the people returned unto Jerusalem.

And he took the people out of the town and put them to work with wood-cutting instruments, and iron grain-crushers, and iron axes, and at brick-making: this he did to all the towns of the children of Ammon. Then David and all the people went back to Jerusalem.

and the people who <FI>are<Fi> in it he hath brought out, and setteth to the saw, and to cutting instruments of iron, and to axes of iron, and hath caused them to pass over into the brick-kiln; and so he doth to all the cities of the Bene-Ammon; and David turneth back, and all the people, to Jerusalem.

And bringing forth the people thereof he sawed them, and drove over them chariots armed with iron: and divided them with knives, and made them pass through brickkilns: so did he to all the cities of the children of Ammon: and David returned, with all the army to Jerusalem.

And he brought out the people that were in it, and put them under the saw, and under harrows of iron, and under axes of iron, and made them pass through the brickkilns. And so did he to all the cities of the children of Ammon. And David and all the people returned to Jerusalem.