Really Good Story and Proof

I heard a story once. I don't remember it exactly but it was really good. I'll tell it how I remember it.

There were these people who were in a war in Israel. There was going to be a battle which would be very hard and they probably wouldn't win. They looked in their Bible and read that there was a spot where David or someone used to win a battle. They were in the same area so they found it with the information given in the passage and they used it to win the battle.

At camp my bible teacher talked about how there was actually proof that the Bible was accurate. In a Greek, or something, manuscript there was a note about the sky being dark in the day for a certain amount of time. It was about the time that Jesus would have died and is the same that is described in the Bible as when God forsook Jesus and it became dark. The Greek (?) manuscript described it as an eclipse.

I don't know if that made any sense but it was really good for me.