From the Richmond Dispatch, 2/23/1863, p. 1, c. 4
Attempted Escape. – Capt. A. C. Webster, an adherent of the bogus Pierpoint Government, made an ineffectual attempt to escape from Castle Thunder on Friday night last. He had disguised himself, and got out of his cell by some means unknown. As soon as he was missed a search was made and he was found crouched in a corner. Webster has been here since the 16th of December.