 After the execution of Oliver Bond and the brothers John and Henry Sheares, Neilson and the remaining prisoners agreed to provide the authorities with details of the organisation of the United Irishmen and plans for the rebellion in exchange for a sentence of exile.Following the suppression of the rebellion, he was transferred to Fort George in Inverness-shire, Scotland, and in 1802 he was deported to the Netherlands.From there he made his way to America, arriving in December 1802.