Redbouts give the defenders the capability to give fire in most directions. They were mostly used as artillery defences. The Confederates used them alot at Kennesaw MT. especially at Chetham hill. The only position without breastworks is the rear. The rear of the defences are unguarded. Most gun positions are infact Redbouts. Vicksburg MS. has tons of great positions to lokk at that would answer your Redan and Lunette questions. The stockades were usually more common at prisons like Andersonville or more during the plains war in the West. Large wooden stakes that jutted out from the ground to form a palisade or makeshift wall. The breastworks are earthworks that are about chest high. Usually the works are earth in the late years, but the stone wall at Fredericksburg was a breatswork.