In 1802, Curran won damages from Major Sirr, who in 1798 had arrested Irish revolutionaries Lord Edward FitzGerald, Thomas Russell and Robert Emmet. Curran spoke for a Protestant, who had volunteered against the Rebellion but had happened to cross Sirr by convincing a jury of the "infamous" character of Sirr's witness in a treason trial, so causing Sirr's case to collapse. Sirr and his colleague were alleged then to have used wrongful arrest, imprisonment incommunicado, and condemnation to hanging as means to extortion and personal satisfaction. Curran implied that these were typical of their methods and of the methods used to suppress the Rebellion. Niles' Register of 24 March 1821 describes Sirr as "this old sinner, given to eternal infamy by the eloquence of Curran'".