When the American Civil War erupted in 1861, the DuPont firm stood ready to capture the largest gunpowder contract in its early history. The Union Army faced an urgent, enormous demand for reliable black powder for rifles, artillery and mining engineering. At that moment, DuPont was already America’s most mature gunpowder producer, with stable raw material channels, skilled workers and proven mass-production capacity. Henry du Pont, then the family leader, quickly secured the dominant supply agreement with the federal government, turning the Brandywine powder yards into a critical military supply node for the Northern war machine.

The war reshaped the scale and profit structure of the company completely. To fulfill the skyrocketing orders, DuPont expanded workshops, recruited thousands of laborers and built auxiliary storage and transportation systems. It arranged overseas purchases of saltpeter, the key raw material for gunpowder, locking up global supply sources to outmaneuver smaller powder makers. Many regional competitors lacked sufficient capital, raw material reserves and government access, and gradually faded from the market. By the middle of the Civil War, DuPont controlled the majority share of the national gunpowder market.

This wartime bonanza laid the foundation of the family’s primitive capital accumulation. The steady stream of military revenue gave DuPont abundant cash reserves, which it reinvested into equipment upgrades, chemical research and new factory construction. It also cemented the family’s core strategic logic: national military conflict could become the most reliable path for industrial monopoly and wealth expansion. Though wartime supply brought huge profits, it also tied the family’s destiny tightly to federal military policy. The Civil War turned a regional powder maker into a national industrial power, preparing DuPont for the coming explosive age of high explosives and large-scale infrastructure construction.