Three problems, plainly stated
Brooks set down the difficulties he expected in approaching Battery Wagner: a front too narrow to work on and too little earth to cover with; a heavy cross-fire from Wagner, Sumter, Battery Gregg and the James Island batteries that would enfilade and take his trenches in reverse; and “the vigilance, skill, and obstinacy of the enemy’s sharpshooters.” All three came true.
Major Brooks’ journal, OR I, 28, Pt. 1