How often did guards shoot POWs at the 'deadline'?

[Picket]

At Andersonville and other Civil War prisons, a captive passing the 'deadline' near the wall risked death. Whatever the number of incidents at camps North and South, the existence of these barriers kept men in line. Here's a look at shootings at several sites. https://civil-war-picket.blogspot.co...-crossing.html