Deuteronomy 20:19-20

When you mount an attack on a town and the siege goes on a long time, don’t start cutting down the trees, swinging your axes against them. Those trees are your future food; don’t cut them down. Are trees soldiers who come against you with weapons? The exception can be those trees which don’t produce food; you can chop them down and use the timbers to build siege engines against the town that is resisting you until it falls. * * *