The book Where Angels Walk tells the story of two undercover cops, Steve and Phil, of Nutley, New Jersey. While they were working to stem the drug trade in their area, they discovered a cave in the woods where drugs were being stored. They wanted to catch the leader and the others involved, so they waited until evening.
Finally, the leader and about a dozen others were in the cave. Steve and Phil called for backup, but the request was denied. So they called for another kind of backup. It was Steve and Phil's habit to pray or read the Bible together before their shift each day. Now, before approaching the cave, they prayed together again for God's help.
They approached the cave and Steve shouted, "Freeze!"—and to his surprise, everyone did. No one moved, and when Phil asked the leader to hand over the package he was holding, he meekly obeyed. When they told everyone to lie prone, they did—with no back talk. They read them their rights, gathered evidence, and waited for the police van from headquarters.
As they were walking the leader to the patrol car, Steve asked him, "Why did the arrests go so easily?" After all, it was a dozen criminals vs. the two cops. The leader said, "Do you think I'm crazy? I saw at least twenty guys in blue uniforms." The leader said to another prisoner, "Belinda, how many cops did you see come into the cave?""At least twenty-five," she said. Steve recalled the words of Psalm 91:11: For he will command his angels concerning you to guard you in all your ways;
Reference: William J. Petersen and Randy Petersen, 100 Amazing Answers to Prayer, (Revell, 2003), pp. 171-173