Hundredth Pennsylvania Private Henderson George recorded his observations on the Union preparations for the Rebel attack on the northwest bastion within a few hours of the end of the fight:

“As an entanglement, our troops during the course of the siege, crawled out at night and wove telegraph wire around the stumps and trees of which there were many, forming a sort of net work; the enemy charging over this wire entanglement were thrown into inextricable confusion, at the same time were swept by [g]rape and canister, and by our rifle fire, and easily repulsed. Our loss was only seven in killed and wounded.”

More from this excellent diary of a young Union soldier.