Bob,
This could be where he was captured. Not sure but it is the only mention of any of them being taken prisoner. FC
"April 23, 1864, at daylight, the enemy attacked the Ninety-second picket, eight miles from camp, guarding a track over Waldon's Ridge; in overwhelming force the enemy surrounded the picket, and 33 out of 62 were killed, captured or wounded; 12 were shot down by the rebels, after they had surrendered and were disarmed."