The hedge and the wall represent the protective care that the Lord had given the kingdoms of Israel and Judah. Because of their wickedness, the Lord will no longer protect them from their enemies. Therefore, the kingdom of Israel was sacked by the Assyrians (~722 BC), and the kingdom of Judah was sacked by the Babylonians (~589 BC). 'Therefore, my people are gone into captivity, because they have no knowledge' (v. 13).