Which revolutionary supply chain innovation, often considered the first modern military retail system, was developed during the American Civil War?

Throughout military history, supply chain logistics have often determined the outcome of conflicts more than tactics or weaponry. From Alexander the Great's revolutionary logistics system to modern military retail operations, the evolution of military supply chains represents one of the most significant yet underappreciated aspects of warfare. Test your knowledge about a pivotal supply chain innovation that transformed military retail operations during a famous conflict.

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The Commissary Department's rolling stores that followed Union troops, allowing soldiers to purchase supplemental goods using credit against their pay
Napoleon's 'Corps of Sutlers' that standardized camp followers into an official retail network with fixed pricing structures
The British Army's Colonial Exchange system that established permanent retail outposts in major garrison towns
The Prussian Military Commerce Corps that pioneered the use of railways for delivering retail goods directly to frontline soldiers