While doing some research on the war of 1812, I discovered that an officer named Lieutenant William Henry Sharpe of the Royal Canadian Rifle Regiment was the commanding officer of Fort Wellington at Prescott Ontario in 1846. Could this be a relative of Richard Sharpe, perhaps another son? Link: http://www.pc.gc.ca/lhn-nhs/on/wellington/natcul/natcul3.aspx#off.
John Blake