From the Richmond Enquirer, 12/29/1862, p. 2, c. 2
RING-LEADER OF A PLOT PUNISHED. – About one hundred and fifty of the prisoners confined in Castle Thunder, combined in a plot, on Christmas night, to assassinate the sentinels and secure their escape. The plot, however, was discovered in good time to prevent its consummation. On Saturday the ring-leader of the arrangement, David Welsh, a Yankee murderer and thief, was discovered. He was punished with stripes, placed in irons, and is now kept on bread and water.