Lower Canada Rebellion
When news of the arrest of the Patriote leaders reached Upper Canada, William Lyon Mackenzie launched an armed rebellion in December 1837. In the meantime, filibusters from the United States, the Hunter Patriots, formed a small militia and attacked Windsor, Upper Canada, to support the Canadian Patriots. This resulted in the declaration of martial law by the Lower Canadian government.
Upper Canada
Although the province is frequently referred to as "English Canada" after the Union of the Canadas, and its ethnic homogeneity said to be a factor in the Upper Canada Rebellion of 1837, it should be noted that there was range of ethnic groups in Upper Canada. However, due to the lack of a detailed breakdown, it is difficult to count each group, and this may be considered abuse of statistics. An idea of the ethnic breakdown can be had if one considers the religious census of 1842, which is helpfully provided below: Roman Catholics were 15% of the population, and adherents to this religion were, at the time, mainly drawn from the Irish and the French settlers. The Roman Catholic faith also numbered some votaries from amongst the Scottish settlers. The category of "other" religious adherents, somewhat under 5% of the population, included the Aboriginal and Metis culture.