After the affair at Big Black bridge Pemberton immediately withdrew his remaining forces to the Vicksburg lines, and before night work was begun preparing the fortifications on the land side for a siege. Moore's brigade was brought back from Warrenton; the defenses at Snyder's Mill and the line of Chickasaw Bayou were abandoned, and all stores that could be quickly transported were sent to Vicksburg. The rest, including the heavy guns, were destroyed. On the morning of the 18th the troops were disposed as follows: Stevenson's division occupied the line south of the railroad, Barton on the river front and in the forts adjacent, Reynolds next to the Hall's Ferry road, Cumming on the left center, and Lee, with Waul's legion, on the left up to the railroad. The next two miles of intrenchments, running north, were held by Forney's division, Moore next the railroad and Hebert on the left. The north line to the river, a stretch of a mile and a quarter, was held by Martin L. Smith's division, Shoup on the right, Baldwin