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.
William Lyon Mackenzie
The rebel leaders escaped to the United States, with Mackenzie arriving in Buffalo, New York on December 11, 1837. On December 12, he delivered an address to the largest public meeting in the history of Buffalo, describing Upper Canada's desire for liberty and their oppression at the hands of the British, and asking for their help. The meeting ended with wild "cheers for Mackenzie, Papineau, and Rolph!" and Mackenzie thus began a recruiting campaign. On December 13, he declared himself the head of a provisional government, entitled the "Republic of Canada". He convinced Rensselaer Van Rensselaer (nephew of Stephen Van Rensselaer III, an American colonel during the War of 1812) to join in a scheme whereby volunteers would invade Upper Canada from Navy Island in the Niagara River. Several hundred volunteers travelled to Navy Island in the next several weeks, as did shipments of food, arms, and cannon shot. Recruitment was hurt, however, when the American government, headed by President Martin Van Buren, instructed the volunteers that they would be prosecuted as criminals if they participated in the planned invasion, and many volunteers returned home.