Francis de Rottenburg, baron de Rottenburg

The Iroquois ambush an American patrol at Forty Mile Creek while the Royal Navy squadron based in Kingston come to bombard the American camp, leading General Dearborn to retreat back to Fort George as he now mistakenly believes he is outnumbered and outgunned.

The British commander, General John Vincent, is heartened by the fact that more and more native warriors are now arriving to assist him, providing about eight hundred additional men.

On June 24, with the help of advance warning by Laura Secord, another American force is forced to surrender by a much smaller British and native force at the Battle of Beaver Dams, marking the end of the American offensive into Upper Canada.

The British commander, General Francis de Rottenburg, does not have the strength to retake Fort George, so he builds a blockade, hoping to starve the Americans into surrender.