After the 1801 Act of Union uniting Ireland and Great Britain, and the broken promises made to Catholics, Daniel O’Connell founded the Catholic Association which combined religious and political demands. Despite the pacifying dimension of the movement, the decades preceding the Great Hunger (1845–1851) saw several episodes of violence, before reaching a climax during the revolutionary movement of 1848. Relying on Philippe Braud’s definition of political violence and the study of British and Catholic authorities’ correspondence among other sources, this article intends to shed light on the different dynamics at work in the rise in violence. It also examines the various attempts to readjust to and withdraw from acts of violence, to move beyond ambiguities and better assess the role played by religious agents.