When a farmer planted a vineyard in Israel, he would build a hedge around it to keep foxes, pest, and other predators out
God refers to Israel as His vineyard and he has built a hedge around it
When Israel slipped into idolatry, God would remove the hedge and the nation would be attacked
Example in Isaiah 5:5
The instant we pray for protection, it is in place = we know this by faith
If not, I leave my family and I open to attack