After the first attack on the right had wellnigh spent itself, and when its renewal, in conjunction with an advance on the centre and left, was momentarily expected, Dwight thought to create a diversion and at the same time to develop the strength and position of the Confederates toward their extreme left, where their lines bent back to rest on the river, and to this end he ordered Nelson to put in his two colored regiments. This portion of the Confederate line occupied the nearly level crest of a steep bluff that completely dominates the low ground by the sugar-house, where the telegraph road crosses Foster's Creek. Over this ground the colored troops had to advance unsupported to receive their first fire. The bridge had been burned when the Confederates retired to their works. Directly in front of the crest, and somewhat below it, a rugged bluff stands a little apart, projecting boldly from the main height with a sharp return to the right, so as to form a natural outwork of great strength, practically inaccessible save by the road that winds along the bottom of the little rivulet at the foot of the almost perpendicular flank. This detached ridge is about four hundred yards in length. It was held by six companies of the 39th Mississippi regiment, under Colonel W. B. Shelby, while behind, in the positions of land batteries III. and IV., were planted six field pieces, and still farther back on the water front the columbiads of Whitfield and Seawell, mounted on traversing carriages, stood ready to rake the road with their 8-inch and 10-inch shell and shrapnel.