 Casement also left for Ireland aboard the German submarine "U-19".He was disappointed with the level of support offered by the Germans and he intended to stop or at least postpone the rising.On Wednesday 19 April, Alderman Tom Kelly, a Sinn Féin member of Dublin Corporation, read out at a meeting of the Corporation a document purportedly leaked from Dublin Castle, detailing plans by the British authorities to shortly arrest leaders of the Irish Volunteers, Sinn Féin and the Gaelic League, and occupy their premises.