The "Philo Parsons" Incident
On September 19, 1864, the American steamer "Philo Parsons" was seized off Kelley's Island, about 56 km southeast of here, by some thirty Confederate sympathizers under John Y. Beale, a Southern naval officer. The group, whose members had embarked at Sandwich and Amherstburg, Canada West, intended to free the Confederate inmates of a prison camp in Sandusky Bay, Ohio. The plan included the capture of the U.S. gunboat "Michigan" for use in commerce raiding and attacks on Great Lakes ports. Arriving off Sandusky Bay the raiders found the "Michigan" forewarned and called off the operation. They returned the following morning to Sandwich, abandoned the steamer and dispersed.
Plaque via Alan L. Brown's site Ontario Plaques. Full page here.