Captain Simon Perkins Jr. and his fellow quartermasters helped make the Union's victory possible by providing the Federal army with clothing and camp equipment, livestock and forage, wagon and railroad transportation, offices, warehouses, and hospitals, despite bad weather, unserviceable railroads, and lack of transportation. "The Supply for Tomorrow Must Not Fail" examines Perkins's responsibilities, the difficult situations he encountered and overcame, and the successes he achieved as part of a team of determined and dependable supply officers, whose duties were critical to successful Union military operations.