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.
Legislative Assembly of Upper Canada
Following the war, the Executive and Legislative Councils became increasingly dominated by the Family Compact, a clique of wealthy individuals led primarily by John Strachan (a member of the powerful Executive Council of Upper Canada), which emerged in 1815. The Compact was deeply opposed to American republicanism and favoured full establishment for the Anglican church in Upper Canada. Their increasingly authoritarian style of governance and disregard for the will of the Legislative Assembly led to demands for government that was more responsible to the people and eventually the Upper Canada Rebellion of 1837. Opposing the Family Compact were initially an assortment of anti-establishment members, but it did not gain strength until a more formal group of reformers emerged, initially led by William Warren Baldwin starting 1820s and then by William Lyon Mackenzie in the 1830s.