The Bloody Assize of 1814-- Part 1: High Treason

From Wikipedia.

A series of trials held at Ancaster, Upper Canada in 1814.  They resulted in treason convictions and subsequent execution of some of the men.

During the War of 1812, a number of Canadians living in the Niagara and  London Districts took up arms against Canadians and supported American raiders.  Many of these men, however, were American-born and later fled back to the United States.

In 1813, several groups of these men were captured and the following year nineteen were charged with high treason and charges were also filed against some who were not in custody and on the American side of the Niagara River.

In May 1814, a special court was established in Ancaster and a series of trials held in June.

--Brock-Perry