No Mac Attack

A view of Mackinac Island from the Lower Peninsula

From Historic Mackinac:...:

Lieutenant [Porter] Hanks' report was not made until August 4, and is dated from Detroit.  He says that the reports of an interpreter and the coolness of the Indians in the neighbourhood first led him to think something was wrong, whereupon he sent Captain Dousman to watch them.  In part, the report which was made to General Hull reads: "On the 16th, I was informed by the Indian interpreter that he had discovered from an Indian that the several nations of Indians then at St. Joseph (a British garrison, distant about forty miles) intended to make an immediate attack on Michilimackinac.