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
There were many outstanding individual reform politicians in Upper Canada, including Robert Randal, Peter Perry, Marshall Spring Bidwell, William Ketchum and Dr. William Warren Baldwin; however, organised collective reform activity began with Robert Fleming Gourlay. Gourlay was a well-connected Scottish emigrant who arrived in 1817, hoping to encourage "assisted emigration" of the poor from Britain. He solicited information on the colony through township questionnaires, and soon became a critic of government mismanagement. When the local legislature ignored his call for an inquiry, he called for a petition to the British Parliament. He organised township meetings, and a provincial convention – which the government considered dangerous and seditious. Gourlay was tried in December 1818 under the 1804 Sedition Act and jailed for 8 months. He was banished from the province in August 1819. His expulsion made him a martyr in the reform community.