I like to watch the old westerns on TV. The battle usually centered on the cowboys and Indians. We would even go out a play cowboys and Indians after school or on Saturday after watching an episode on TV. One thing that was in every movie was the rescue. The cowboys would be surrounded by overwhelming numbers and doomed. It seemed like they wouldn’t be returning next week. But, at the last possible minute the cavalry would come to the rescue.
The angel said, "Do not be afraid", because Almighty God is coming the rescue, salvation, to the hopelessness, the sinfulness, the sorrow and woe of this world.