Albert Barnes Commentary Zechariah 11:2

"Wail, O fir-tree, for the cedar is fallen, because the goodly ones are destroyed: wail, O ye oaks of Bashan, for the strong forest is come down." — Zechariah 11:2 (ASV)

Howl, O cypress, for the cedar is fallen - Jerusalem or the temple, having been likened to Lebanon and its cedars, the prophet carries on the image, speaking of the priests, princes, and people, under the title of firs, cypresses, and oaks—trees inferior, but magnificent. He shows that it is imagery, by ascribing to them the feelings of people.

The more glorious and stately, “the cedars,” were destroyed. Woe then to the rest, “the cypress;” as our Lord says, If they do these things in the green tree, what shall be done, in the dry? (Luke 23:31), and Peter says, If the righteous scarcely be saved, where shall the ungodly and the sinner appear? (1 Peter 4:18).

For the defended forest has come down - That which was closed and inaccessible to the enemy. All that was high and lifted up was brought low, “came down,” even to the ground.