Martha founded the Coston Manufacturing Company to produce and market her signaling flares. She faced significant challenges as a woman in a male-dominated industry, but her determination and business acumen helped her succeed.

Martha actively promoted her flares to the U.S. Navy, highlighting their effectiveness and reliability for nighttime communication. Her demonstrations proved convincing, leading to the Navy's adoption of the Coston flare.

The Coston flares played a crucial role in naval operations during the Civil War, enabling ships to communicate effectively at night and in adverse weather conditions. They were used for signaling, coordinating attacks, and providing warnings.

The demand for Coston flares increased dramatically during the Civil War, requiring the company to expand its production capacity. Martha managed the business operations and oversaw the manufacturing process, ensuring that the flares met the Navy's specifications.

The Coston Manufacturing Company achieved significant financial success during the Civil War. However, Martha also faced challenges in managing the business, dealing with suppliers, and competing with other manufacturers.