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Rains was wounded during the Battle of Seven Pines, and was singled out by Maj. Gen. Daniel Harvey Hill for a successful flanking maneuver that turned the tide of battle in favor of the Confederates. Rains, who turned 59 a few days after the battle, was one of the oldest officers in the Confederate army, and it was decided to reassign him to a less physically demanding job. After recovering from his wounds, he was then placed in command of the conscription and torpedo bureaus at Richmond. He organized the system of torpedoes and mines that protected the harbors of Charleston, Savannah, Mobile and other port cities, and invented an early land mine that was successfully used in battle.