I think I'm missing something. Are these the tunnels that Burnside's men were digging or the two tunnels that were being dug on on the Confederate side as they had a pretty good idea of what was going on?
I have always considered Ambrose Burnside to have perpetual bad luck or poor planning. The soon to be dismissed from the army James Hewett Ledlie and I'd add Edward Ferrero, a know, the drinking buddies? Just awful and truly dangerous human beings.
I had never seen this photo before. The crater photo I was very familiar with as I had at worked Petersburg. The large tree near the mine entrance seen in many images of the entrance was still there until the 80's, when it fell.