“And when he had apprehended him, he put him in prison, and delivered him to four quaternions of soldiers to keep him; intending after Easter to bring him forth to the people.”
King James Version (KJV)
12:4 Four quaternions - Sixteen men, who watched by turns day and night.
Ac 12:4 Four quaterions of soldiers. Sixteen soldiers divided into four watches, so that four would be on watch all the time, two in the prison and two at the door.