In his book Angels, Billy Graham relates the story told by Reverend John G. Paton, a trail-blazing missionary in the South Pacific in the New Hebrides Islands.  The story illustrates how God provides angels to protect and care for His believers. 

One night Paton and his wife found themselves threatened by hostile natives who surrounded their mission headquarters.  The Patons thought for sure that the natives would burn down the headquarters and kill them both.  They prayed throughout the night asking God to protect them from harm.  The next morning they were astonished when they realized that the natives had gone away.  They had no idea where or why they had left.  The missionaries again prayed and thanked the Lord for saving them.

About a year later, the chief of the native tribe who had threatened them became a Christian.  He came to visit the Patons.  When he was asked about the incident of that night of terror, the chief told the Patons that he and his men were too fearful to carry out their plans of attack.  They had seen an army of giant men in “shining garments with drawn swords in their hands” surrounding the mission grounds.  Paton and the chief agreed that there was no explanation other than that God had sent angels to keep the missionaries from harm.

This story is similar to the one told in 2 Kings 6:17:  “Then Elisha prayed and said, ‘O LORD, I pray, open his eyes that he may see.’  And the LORD opened the servant's eyes and he saw; and behold, the mountain was full of horses and chariots of fire all around Elisha.”