Duncan Clark, as well as soldiers under Maj. Rowland Heathcote from the Royal Newfoundland Regiment, were escorting a shipment of supplies from Montreal to Kingston when they were attacked in the St. Lawrence River near Matilda by 500 American Militia, under the command of Capt.

The Americans were pinned down by accurate fire from the Dundas men, concealed amongst the bushes and trees, and they were forced to retreat back to Toussaint's Island.

Monroe and Dulmage and Lt. Richard Duncan Fraser who brought along a 9-pounder artillery piece from Prescott that had originally been captured during the Battle of the Thousand Islands.

After a few rounds of fire from the cannon and muskets, the Americans abandoned the island and retreated across the St. Lawrence River to the New York side.

[2] The St. Lawrence front was quiet again until September when the Americans raided Gananoque, and the militia would retaliate in October with the Assault on Ogdensburg.