During the attack, only small garrisons were left in the Union forts and trenches. Wright had about 14,000 troops to attack about 2,800 defenders over about of line. Forming for mass attack just behind the Union picket line, Wright's entire corps was placed in a wedge formation about wide. Brigadier General (Brevet Major General) George W. Getty's Second Division was in the middle front and in advance of the other two brigades for the assault while Brigadier General (Brevet Major General) Frank Wheaton's First Division was on the right rear and Brigadier General Truman Seymour's Third Division was on the left rear. Despite the close formation, brigades were to keep intervals between them and the lines in each brigade were to be kept at least 50 paces apart.