In 1842 Duffy had already allied himself with James Godkin who had abandoned a Bible mission to campaign for the rights of the Catholic tenants he had been tasked with bringing into the Protestant fold.Smith, G.B., 'Godkin, James (1806–1879)', rev. C. A. Creffield, Oxford Dictionary of National Biography (Oxford University Press, 2004) He now looked to McKnight and to Crawford. Together they called a convention in Dublin to which upwards of forty members of Parliament, and about two hundred Catholic and Presbyterian clergymen responded. With McKnight presiding, the assembled formed the all-Ireland Tenant Right League dedicating to securing concession of his "three F's’".
