"Soon I saw the saints suffering great mental anguish. They seemed to be surrounded by the wicked inhabitants of the earth. Every appearance was against them. Some began to fear that God had at last left them to perish by the hand of the wicked. But if their eyes could have been opened, they would have seen themselves surrounded by angels of God. Next came the multitude of the angry wicked, and next a mass of evil angels, hurrying on the wicked to slay the saints. But before they could approach God's people, the wicked must first pass this company of mighty, holy angels. This was impossible. The angels of God were causing them to recede and also causing the evil angels who were pressing around them to fall back. EW 283.1"
"And Elisha prayed, and said, Lord, I pray thee, open his eyes, that he may see. And the Lord opened the eyes of the young man; and he saw: and, behold, the mountain was full of horses and chariots of fire round about Elisha."
The idea of unseen angels protecting God's people parallels the story of Elisha and his servant, where God opened the servant's eyes to see the angelic army.