The Shiners' War was a conflict between Irish Catholic immigrants and French Canadians in Bytown from 1835 to 1845. The war started when Peter Aylen, a major Irish timber operator, organized a group of Irishmen to attack other timber operations. This group was known as the "Shiners." They attacked French Canadian timber rafts and fought against the French Canadian on the streets of Bytown.
The Shiners also attacked political institutions. In the August 1835 Aylen and his supporters went to The Bathurst District Agricultural Society's annual meeting. His violent supporters incited the attending members to elect Aylen as President of the society. Aylen attempted the same strategy to take over a Nepean Township meeting but was met with too much resistance.
Bytown's citizens created "The Association of the Preservation of the Public Peace in Bytown" which included armed patrols to try to control the violence, but it still continued. In the spring of 1837 the government deployed troops to arrest the Shiners and the violence was brought under control. Occasional violence still occurred until 1845 by groups claiming to be the Shiners.
At the time the Rideau Canal had just been constructed, so many Irishmen who were working on the canal were now out of work. Also, the Irish were considered to be at the lowest rung of the social ladder because of historical antipathy and their refusal to assimilate.Peter Aylen was sympathetic to these Irishmen which gained him their allegiance. He ordered them to attack the French Canadian to drive them out of the area so that the Shiners could take their jobs. Aylen gained an advantage from this violence because it disrupted his competitors.