The Battle of Fort Dearborn did not occur at the fort, but on the shores of Lake Michigan, on August 15, 1812. It ended in the death of more than fifty American soldiers, women, and children and fifteen Potawatomi fighters. The violence is often included in stories of Chicago’s founding, but rarely do these narratives include the larger context of which the battle was one part.

In June of 1812, Shawnee leader Tecumseh was coordinating an intertribal resistance movement against American invasion, and he and his allies laid out a plan to attack several American forts later that summer: Fort Madison in present-day Iowa, Fort Wayne and Fort Harrison in present-day Indiana, and Fort Dearborn at Chicago. The attacks would be coordinated through wampum belts, small beads made from shells that were strung together to record histories and communicate messages.

However, as Tecumseh and his allies made plans, war broke out between the Americans and the British. In the midst of this colonial conflict, many Native leaders, including Tecumseh and Chicago Potawatomi leader Main Poc, chose to ally with the British, hoping that the defeat of the Americans would stop the increasing flood of white settlers into Native lands. Knowing this, the commander of Fort Dearborn, Captain Nathan Heald, organized a meeting with Potawatomi leaders on August 15, 1812 to negotiate the American surrender of the fort and secure their safe passage to Fort Wayne (in modern-day Indiana). They came to an agreement, but the US forces instantly went back on their word and destroyed the supplies they had agreed to distribute to the Potawatomi.

The night before the battle, a wampum belt was delivered to Potawatomi leader Mad Sturgeon signaling war should begin. Since those at Fort Dearborn had been ordered to evacuate the next day, it was an ideal time to attack the American garrison and the betrayal by Heald had further angered Potawatomi leadership.On the morning of the evacuation from the fort, Potawatomi fighters, along with Kickapoo, Sauk, and Ho-Chunk allies, attacked the convoy of American soldiers, civilians, and their Myaamia allies who were leaving the fort. Until very recently, Chicagoans have mistakenly called the events that followed a massacre, but most historians now call it the Battle of Fort Dearborn, in part because of its place within the larger War of 1812 and Tecumseh’s resistance movement.