For thus hath the LORD of hosts said, Hew ye down trees, and cast a mount against Jerusalem: this is the city to be visited; she is wholly oppression in the midst of her. Cast - Hebrew, pour out; referring to the emptying of the baskets of earth to make the mound formed of "trees" and earthwork, to overtop the city walls. The "tress" were also used to make warlike engines with.
This - pointing the invaders to Jerusalem.
Visited - i:e., punished.
Wholly oppression - or join "wholly" with "visited" - i:e., she is altogether (in her whole extent) to be punished (Maurer).