“The day of Peter’s execution was at last appointed, but still the prayers of the believers ascended to heaven; and while all their energies and sympathies were called out in fervent appeals for help, angels of God were watching over the imprisoned apostle… To prevent all possibility of release, Peter had been put under the charge of sixteen soldiers, who,in different watches, guarded him day and night. In his cell he was placed between two soldiers and was bound by two chains, each chain being fastened to the wrist of one of the soldiers. He was unable to move without their knowledge agile project methodologies. With the prison doors securely fastened, and a strong guard before them, all chance of rescue or escape through human means was cut off. But man’s extremity is God’s opportunity.”
Acts of the Apostles p.145