Blockhouse Island
On this island, formerly known as Hospital Island, stood the sheds erected to house emigrants who were victims of cholera in the great epidemic of 1832. Many persons died here, including Doctor Robert Gilmour a native of Scotland and president of the first Board of Health in Upper Canada, who was stricken while attending the sick. During the Rebellion of 1837-38, a blockhouse was erected here for the defence of Brockville. It was destroyed by fire in 1860.
Plaque via Alan L. Brown's site Ontario Plaques. Full page here.