After Fort Mackinac's defeat the indians grew bolder as did the british. next to fall was Fort Dearborn. Here is an overview

""Fort Dearborn


As word spread of the British victory at Mackinac, the Indians began to gather around other American forts. They gathered at what is now Chicago near Fort Dearborn, where Captain Nathan Heald commanded the small garrison of about 50 men. In response to the order from General Hull to withdraw to Fort Wayne, he first distibuted much trade goods to the Indians in return for promises of safe conduct, and then set out on the morning of August 15th with his soldiers, a handful of local settlers and militia, and their families. At the head of the column was Captain William Wells, a veteran Indian fighter who served under Anthony Wayne; he had come from Fort Wayne with 30 friendly Miami braves to lead the way back. The garrison did not trust the Indians; prophetically the fife and drums played the funeral march as they started out.
The hostile Indians waited in ambush behind some nearby sand dunes. Wells saw them and gave the alarm, just before an attack that killed about half the regulars. The others rallied and charged them driving them back across the dunes- but in the process became separated from the baggage train where most of the women and children rode. The Chicago militia guarded that part of the column. Militia and families were quickly overwhelmed and most of them slaughtered. In the fight Wells was killed, scalped, and his body was beheaded. His Miami Indians had long since fled. The remaining soldiers held a parley in which the hostile Indians promised that if the Americans surrendered none of them would be harmed. They agreed. and as they were led back to Fort Dearborn they passed the baggage train where they saw the women and children "lying naked with principally all their heads off." Once back at the fort, the Indians soon began to torture and kill their captives. The few survivors were taken away in all directions after the departing Indians had burned the fort. Both Captain and Mrs. Heald were badly wounded, but survived the battle, ending it in the hands of different groups of Indians. The family of John Kinzie, a nearby fur trader the Indians considered a neutral, waited in a boat near shore in case they had to flee. Mrs. Kinzie saw Mrs. Heald's predicament and sent one of her husband's clerks to trade an old mule and some whiskey to the band holding her, so that they would transfer to the one that held her husband. Eventually the Healds escaped and after a three hundred mile voyage in a canoe made their way to Mackinac. There Captain Roberts, the British commander, gave them a small sailboat and sent them to Detroit."""