Hobson was elevated to the IRB's Supreme Council in 1911, which coincided with the resignations of P.T. Daly, Fred Allen and Sean O'Hanlon, opening the way for Tom Clarke and the younger men to take control of the IRB. In 1913 he was elevated to the chairman of the Dublin Centres Board of the IRB, and later that year was one of the founding organisers of the Irish Volunteers, remaining a primary connection between the Volunteers and the IRB. He put together the plan to bring sufficient Volunteers and their supporters, discreetly to Howth on Sunday, 26 July 1914, to unload and distribute the arms being landed from the "Asgard" at Howth.