By what means were the apostles delivered from prison?

Answer

"The angel of the Lord by night opened the prison doors, and brought them forth." Acts 5: 19.

What would make the death of Christ in vain?
What only does Christ recognize as proper ground for dissolving the marriage relationship?
BY whom was the Ten Commandment law proclaimed?
How was this covenant then confirmed and dedicated?
When Moses came down from Sinai, what did he see?
What part will the angels have in this event?
What protection has God promised His people during the seven last plagues?

Questions & Answers are from the book Bible Readings for the Home Circle