Earl J. Hess. Trench Warfare under Grant and Lee: Field Fortifications in the Overland Campaign.:Trench Warfare under Grant and Lee: Field Fortifications in the Overland Campaign. (Civil War America.).
Earl J. Hess. Trench Warfare under Grant and Lee: Field Fortifications in the Overland Campaign.:Trench Warfare under Grant and Lee: Field Fortifications in the Overland Campaign. (Civil War America.).
