Albert Barnes Commentary Jeremiah 12:10

"Many shepherds have destroyed my vineyard, they have trodden my portion under foot, they have made my pleasant portion a desolate wilderness." — Jeremiah 12:10 (ASV)

Nebuchadnezzar and his confederate kings trampled Judah under foot, as heedless of the ruin they were inflicting as the shepherds would be who led their flocks to browse in spring upon the tender shoots of the vine.